Emmanuel Ademola Anigilaje
Zaheer Ahmad Nasir
Christopher Walton*‡- School of Water, Energy and Environment, Cranfield University, Cranfield, United Kingdom
Introduction: In Nigeria, because of increasing population, urbanization, industrialization, and auto-mobilization, petrol is the most everyday non-edible commodity, and it is the leading petroleum product traded at the proliferating Nigeria's petrol stations (NPSs). However, because of inadequate occupational health and safety (OHS) regulatory measures, working at NPSs exposes petrol station workers (PSWs) to a large amount of hazardous benzene, toluene, ethylbenzene, and xylene (BTEX) compounds.
Methods: Studies on BTEX exposures among Nigerian PSWs are scarce. Thus, constraints in quantifying the health risks of BTEX limit stakeholders' ability to design practical risk assessment and risk control strategies. This paper reviews studies on the OHS of Nigerian PSWs at the NPSs.
Results: Although knowledge, attitude, and practices on OHS in NPSs vary from one Nigeria's study setting to another, generally, safety practices, awareness about hazards and personal protective equipment (PPE), and the use of PPE among PSWs fell below expectations. Additionally, air quality at NPSs was poor, with a high content of BTEX and levels of carbon monoxide, hydrogen sulfide, particulate matter, and formaldehyde higher than the World Health Organization guideline limits.
Discussion: Currently, regulatory bodies' effectiveness and accountability in safeguarding OHS at NPSs leave much to be desired. Understanding the OHS of NPSs would inform future initiatives, policies, and regulations that would promote the health and safety of workers at NPSs. However, further studies need to be conducted to describe the vulnerability of PSWs and other Nigerians who are occupationally exposed to BTEX pollution. More importantly, controlling air pollution from hazardous air pollutants like BTEX is an essential component of OHS and integral to attaining the Sustainable Development Goals (SDG) 3, 7, and 11.
1 Background and purpose
The petroleum products traded at Nigeria's petrol stations (NPSs) are engine lubrication oil, petrol, diesel, kerosene and cooking gas, but petrol is the leading commodity (1). In 2018, there were 29,197 petrol stations in Nigeria (2). This proliferation is attributed to the country's increasing population, urbanization, industrialization, auto-mobilization, and energy use (3, 4). The daily petrol consumption in Nigeria is about 93 million liters (5). With 198 million people and a motor vehicle population of 11,760,871 in 2018, Nigeria has 0.06 vehicles per person (6). However, most (97.4%) of the available vehicles in Nigeria are imported second-hand vehicles (7), which have been associated with low energy efficiency, high fuel consumption, and high emission of greenhouse gases (GHGs), including carbon dioxide, carbon monoxide, nitrogen oxides, unburned hydrocarbons, and particulates such as soot and ash (8–11). Furthermore, within Nigeria's context of perennial inability to generate, transmit and distribute sufficient electricity (12, 13) and the unaffordability of zero-emission electric vehicles (ZEEVs) (14), Nigerians will continue to depend on gasoline and diesel for their auto-mobiles, and for fuelling their electric generators at homes and businesses (4, 15–17). In Nigeria, petrol station workers (PSWs) typically dispense fuel, unlike self-service dispensers, which are more common in advanced countries (4). Thus, NPSs are an indispensable sector of Nigeria's economic activities, where humans and petroleum products will continue to interact. Unfortunately, the petrol being officially sold in Nigeria has a permissible content of benzene of 2% v/v1 compared to 1% (v/v) in Europe (18) and 0.62% (v/v) in the United States (19). In general, petrol contains about 2–18% of benzene, toluene, ethylbenzene and xylene (BTEX) (20, 21). BTEX harm the environment and human health because of their properties and residence times in the atmosphere (22). Nevertheless, BTEX must be added to unleaded gasoline and diesel to act as an antiknock and lubricating agent to improve machine efficiency (23, 24).
BTEX is a mono-aromatic mixture found in natural and anthropogenic sources (25). The natural sources of BTEX are natural gas and petroleum deposits, volcanoes, and wildfires (25). The anthropogenic sources include emissions from aircraft and cigarette smoke; however, in urban areas, the combustion of gasoline and diesel fuels, especially for motor vehicles, constitutes an essential source of BTEX (25–27). Additional sources of BTEX in urban air are emissions from gas stations and small-scale industries that use chemical compounds containing BTEX (paint, adhesives, etc.) (28, 29). BTEX is also a common additive to some chemical intermediates, pharmaceutical products, and consumer products (inks, cosmetics) (30).
BTEX is the main representative of volatile organic compounds (VOCs) (31). By definition, VOCs are photochemically reactive species with high vapor pressure in the Earth's atmosphere (32).VOCs are hazardous air pollutants (HAPs) because they are harmful to the environment and human health due to their properties and residence times in the atmosphere, which can last from a few minutes to several months (22, 23, 33). The residence time of BTEX in the atmospheric air depends on air dispersion and photochemical decomposition with hydroxyl (.OH) oxidant and chloride radicals (34). Thus, apart from diffusion and distance from the source (31, 35), BTEX concentration in the atmospheric air also depends on the BTEX content of the fuel (36) and on atmospheric hydroxylation, which is dependent on temperature (37), seasonal, geographical, altitudinal and diurnal variations (38). According to Atkinson et al. (39), benzene has an estimated lifetime reaction with OH radical of 9.4 days, followed by toluene (1.9 days), ethylbenzene (1.6 days), o-xylene (0.8 days) and m, p-xylene (0.6 days). In other words, while xylene is considered a highly reactive species, ethylbenzene and toluene are less reactive, and benzene is a relatively stable species (40). The concentration of BTEX is usually lower in warmer months due to the strong photolysis and the dilution caused by the increase in the depth of the mixing layer (41). Furthermore, the concentration of BTEX tends to increase during winter due to the frequent occurrence of the inverse temperature layer (31). BTEX accumulation in the air is also higher during cloudy days than sunny days due to lower temperatures and light intensity (31). The BTEX contents are also affected by factors such as prevailing wind direction and wind velocity (42).
Although exposure to BTEX is usually a simultaneous exposure to all its constituent parts, the harmful impacts on human health are better appreciated by considering the individual impacts of each constituent, as multiple human epidemiological studies are available (25). Table 1 summarizes the acute and chronic effects of BTEX in humans (43–46). TEX also forms secondary air pollutants, including ozone, ultra-fine particulate matter, and polycyclic aromatic hydrocarbons that contribute to ill health in humans (31, 47–50).
Table 1. The acute and chronic effects of BTEX in humans.
Human occupational exposure to BTEX from petrol is a significant health concern, and pieces of evidence abound to prove that PSWs are more at risk of BTEX exposure and health hazards (21, 51, 52). Quantifying BTEX exposures and the health risks among PSWs have been of research interest in Asia, Europe, Canada, and North America (18, 52–64). The results of these studies indicated that PSWs were at a higher risk of adverse cancer and non-cancer health risks (52, 56, 60, 62, 64–66). Although the petroleum oil and gas industry contributes about 9% to Nigeria's gross domestic product (GDP) (67), assessing BTEX exposure among PSWs is a rare research focus in Nigeria. This dearth of data exists despite prevailing conditions that expose PSWs in Nigeria to a high volume of BTEX. For example, the dispensing pumps at Nigeria's filling stations are often powered by gasoline-electric generators, which add to the ambient air pollution at the filling stations. In addition, most of these dispensing pumps have no mechanism for vapor recovery (68, 69), and some of Nigeria's PSWs work for long hours daily ranging from 10 h (69) to more than 12 h (70). Exposure to petrol/BTEX is expected through the skin via inadvertent spills on the body while dispensing petroleum products as the use of personal protective equipment (PPE) is uncommon (16, 71–73). Exposure to BTEX through the gastrointestinal tract also happens due to poor personal hygiene as PSWs on working shift take their meals without washing their hands (16, 69), and PSWs occasionally siphon fuels from the tanks of automobiles (70, 74).
Furthermore, although the four Nigerian crude oil refineries (Port Harcourt I and II, Warri, and Kaduna) run by the state-owned Nigerian National Petroleum Corporation (NNPC) can process 445,000 barrels of crude oil daily, they operate for < 50% of their capacity for years before they were shut down in 2020, having reached zero refining activity in 2019 (75). As of 2017, the total demand for petroleum products in Nigeria was 750,000 barrels per day, already more than the refineries' 445,000 barrels capacity (76). Consequently, 70–80% of the country's petroleum products are imported to meet the national demands (76). Reasons for the underutilization of the national refineries include poor governance, lack of major turnaround maintenance, vandalization of pipelines supplying crude oil to refineries and pipelines carrying petroleum products from the refineries, and inappropriate regulations of the price of the petroleum products that lead to under-recovery of crude oil cost (76). West Africa imports around 50% of its fuels from Amsterdam, Rotterdam, and Antwerp (“ARA” region) (77). However, 80% of the diesel exported from ARA to Africa has sulfur content at least 100 times above the European standard (77). Africa's weak fuel standards enable European traders to use low-quality, cheap blend-stocks to produce low-quality “African Quality” fuel, which damages health with high sulfur, aromatics, and benzene levels (77, 78). Thus, while countries in West Africa export crude oil with low sulfur content, they import petroleum products with high sulfur content from Europe and the US (77). Since the report of Gueinat et al. (77), five West African countries (Nigeria, Ghana, Benin, Togo, and Cote d'Ivoire) announced that they will ban the import of high-sulfur fuel (79). However, Nigeria's current specification for sulfur content in petrol remains at 150 part per million (ppm)2, value that is still higher than the European limit of 10 ppm (77).
Nigeria's leading petrol and diesel imports are from the Netherlands, Belgium, India, Norway, and the United Kingdom (80). However, imported petrol from Antwerp in February 2022 was found to have an excess amount of methanol, causing engine damage in vehicles in Nigeria (80). This highlights poor quality checks for petrol specification at load ports and in Nigeria and the need for stringent regulations to ensure the safety and quality of imported products. Furthermore, before 2004, Nigeria was one of the countries with high Tetraethyl lead (TEL) concentration as an octane promoter in its gasoline. However, Nigeria adopted the “Phasing-out leaded gasoline in Nigeria's Initiative” of the World Bank Clean Air Initiative. Nigeria adopted a two-step approach, reducing to 0.15 g Pb/l from 0.2 g Pb/l by the end of 2002 and a total phase-out of leaded gasoline by 2004 (81, 82). Although Nigeria was officially acknowledged to have phased out leaded gasoline in 2004, some Nigerian investigators (83–89) have documented higher blood levels of lead among Nigerian PSWs compared to controls that were not occupationally exposed to gasoline. These findings may not be unexpected as gasoline in Nigeria still contains a lead specification of 50 ppm (see text footnote 2).
To inform future initiatives, policies, and regulations that will safeguard Nigeria's PSWs, a better understanding of the occupational health and safety (OHS) of NPSs is required. Specifically, the burden and the challenges of exposure to BTEX at NPSs must be well-documented. Unfortunately, the inability to quantify the health risks (cancer and non-cancer risks) of BTEX will continue to limit Nigerian stakeholders in designing practical risk assessment and risk control strategies. The detection and quantification of air pollution at Nigeria's petrol stations will significantly enhance workplace health and safety standards by pro-actively addressing occupational risk factors that may affect the wellbeing of employees. It will enable swift and resolute measures at every level, including petrol stations, regulatory bodies, and policy-makers, to avert work-related illnesses and injuries and foster optimal workers' health. Studies on OHS at NPSs are essential for stakeholders to establish a baseline, track progress, draw comparisons, and advocate for risk control strategies.
While prefacing a background of Nigeria's geography and energy mix and Nigeria's environmental pollution and climate actions, this paper reviews the existing studies on air quality at NPSs, including observational and analytical studies on OHS of Nigerian PSWs at the NPSs. The review describes the exposure of Nigerian PSWs to BTEX/petrol and other hazards at NPSs. It presents opportunities for a future direction to safeguard the health and safety of Nigeria's PSWs and others who may be occupationally exposed to petroleum products.
1.1 Nigeria's geography and population
Nigeria has an area of 923,768 square kilometers and is the most populous country in Africa, with an estimated population of about 225 million people in 20223. Nigeria comprises 36 States and Abuja, the Federal Capital Territory (see text footnote 3). The States are aggregated into six geopolitical zones: North-west (NW), North-east (NE), North-central (NC), South-west (SW), South-east (SE), and South-south (SS) (Figure 1). The countries at Nigeria's borders include the Benin Republic to the West, Cameroon to the East, and the Niger Republic to the North (see text footnote 3). Nigeria is a lower middle-income country (LMIC) (90). As of 2022, Nigeria's GDP is 477 United States Dollars (USD), Gross National Income per capita is 2,140 USD, and the total unemployment rate is 5.8% (90). Nigeria is a major producer and exporter of oil in Africa, with significant crude oil reserves, which stood at 37,448.25 million barrels in 2014 (91). Nigeria's crude oil accounts for about 9% of the total GDP and 96% of its export earnings (67, 92, 93).
Figure 1. Map of Nigeria showing the 36 states and federal capital territory as well as the six geopolitical zones. Reproduced from Management Commission. niMC enrolment centers. Available from: https://www.nimc.gov.ng/nimc-enrolment-centres/.32. Available via license: Creative Commons Attribution-NonCommercial 4.0 International.
1.2 Nigeria's energy and electricity mix
Nigeria's primary energy consumption in 2017 was about 1.5 quadrillion British thermal units (94). Natural gas (42%), petroleum, and other liquids (55%) are the major energy consumption, while traditional biomass and waste (wood, charcoal, manure, and crop residues), coal, and renewable energy only accounted for 3% (94). Some Nigerian households use biomass energy to cook in poorly ventilated kitchens (95, 96).
In 2017, Nigeria's generation capacity was 12,664 megawatts (MW), of which 10,522 MW (83%) was from fossil fuels, 2,110 MW (17%) was from hydroelectricity, and 32 MW (< 1%) was from solar, wind, and biomass and waste (94). The solar energy is available to very few Nigerians (97). Net electricity generation was far lower than capacity and was 30.6 billion kilowatt-hours (3,495 MW) in 2017, or about 28% of total capacity (94). Although Nigeria is the continent's largest economy, only 60% of the population had access to electricity in 2018 (94). Most of Nigeria's fossil fuel-derived electricity is from natural gas, and crude oil is mainly used for backup power generation (94). Nigeria does not generate energy from nuclear or geothermal sources (91).
Although Nigeria has ambitious electricity mix targets, generating electricity faces persistent challenges, including inadequate power generation due to financial constraints, and problems with energy transmission and distribution (12, 93, 98, 99). Privatization of generation and distribution has yet to eliminate these problems (12, 98). Transmission challenges include mismanagement issues, poor maintenance, and inefficient grid design (12, 98). Consequently, Nigeria's electricity shortfall is met with diesel and gasoline-powered electric generators at homes and at business centres, with some of these electric generators operating between 15 and 18 h a day (17). A staggering $22 bn (about 5% of GDP) is spent yearly to fuel electric generators in Nigeria (93).
1.3 Nigeria's environmental pollution
Because of increasing population and rapid urbanization, Nigeria is replete with many environmental problems, including rapid deforestation, soil degradation and loss of arable land, illegal exploration and refining of crude oil, uncontrolled gas flaring, and ambient and household air pollution [(100); see text footnote 3]. Gas-flaring in Nigeria is seventh in the world (6.6 billion cubic meters of flared gas) producing about 17.76 Mt of CO2 emissions as of 2021 (101). Electric generators are sources of air pollution emitting fine particulate matter (PM) and black carbon from internal combustion of diesel and gasoline. Nigerians also buy fuel in plastic containers for their electric generators from the filling stations (102); air pollution also results from evaporative and spillage losses of diesel and petrol in transit from these plastic containers. Nigeria's efforts at mitigating air pollution from electric generators culminate in the flagging off of the National Generator Emission Control Programme (NGECP) in January 2023 (103). The NGECP involves yearly testing of electric generators for toxic and GHG emissions (103). Other sources of ambient air pollution in Nigeria include the burning of e-waste, emissions from waste incinerators, gaseous emissions from dump sites, and gaseous emissions from industries (104, 105). Thus, many Nigerians suffer pollution-related health problems (106) including cardiovascular diseases, mental health problems, and chronic obstructive pulmonary diseases (pneumonia, emphysema, and bronchitis) (107). Nigeria is the fourth leading country with deaths from air pollution (108). An estimated 114,000 Nigerians die from air pollution each year in Nigeria (108). Air pollution was also reported to be a major risk factor responsible for 15% of under-five mortality in Nigeria (109).
1.4 Nigeria's transportation system and transportation-related pollution
The commonest source of BTEX in urban areas is transportation activity resulting from incomplete combustion in motor vehicles (110, 111). The transport sector is Nigeria's greatest carbon-dioxide emitter, accounting for about 60% of total national emissions (94). It comprises road, rail, air, and marine sub-sectors; however, the road transport sector is the primary means of moving goods and people across the country (92, 112). Road transport contributes significantly to the nation's GDP (2.7%) (92). Nigeria's transport system comprises more of the least energy-efficient (road and air transport) system, which emits higher GHGs compared to the most energy-efficient sub-sectors (rail and water transport) (14). Passenger transport dominates road transport, as evidenced by a predominance of privately owned cars and light commercial vehicles (92). In 2018, ownership of road vehicles in Nigeria comprised commercial (57.70%), private (40.98%), and Government and diplomatic (1.32%) vehicles (6, 14). Nevertheless, Nigeria's opportunities for low-carbon transport include the use of biofuels (1.5 billion liters planned capacity), natural gas (187 trillion cubic feet) with the use of Compressed Natural Gas (CNG) fuelled vehicles, electrified transport coal (2.7 billion tons), or natural gas power generation sources (92). Challenges include the facts that Nigeria is yet to develop its biofuels program, a slow transition to expensive energy-efficient vehicles as about 60% of the country's population still lives below the poverty line (92), and slow adoption of ZEEVs as only about 60% of the Nigerian population has access to electricity (94). Moreover, transportation-related air pollution and carbon-dioxide emissions are worsened by the pervasive use of used motor vehicles (cars, trucks, lorries, buses, and motorbikes) in Nigeria (113, 114). In 2023, Nigeria's used car market of 500,000 sales (compared to 13,000 sales for brand-new vehicles), valued at $1.14 billion, constitutes 97.4% of available vehicles in the country (7). This market is estimated to grow by 8.9% in 2024 due to high inflation, declining GDP, and the spike in new car prices (7). Although the Nigeria Customs Service increased the import duty on vehicles from 39.45 to 39.62% to promote domestic manufacturing of vehicles and reduce imported cars, this has not reduced the dependence on used cars (115). Nigeria's import regulation limits used vehicle age to 15 years (116), however, this policy has failed to reduce the number of imported used vehicles (117). The complexities in the regional market for used vehicles in West Africa are such that trade restriction rules in Nigeria are often circumvented by the viable re-exportation of used cars from the alternative import routes from the neighboring countries of Benin and Togo Republics (117, 118). Benin and Togo have no age restriction for used vehicles, and they use a low-import tariff strategy to re-export to Nigeria (117, 118). Launched in January 2023, the National Vehicular Emission Control Programme (NVECP) provides annual testing of vehicles for toxic and GHG emissions (103). Sadly, the use of ZEEVs is uncommon in Nigeria due to high upfront costs, lack of charging infrastructure, lack of technical know-how, and political entrenchment of oil and gas (119). ZEEVs do not produce emissions irrespective of age, compared to internal combustive engine (ICE) vehicles, where emissions intensity can increase over time and more with a lack of maintenance (119). While Nigeria has the potential to import used ZEEVs, policymakers worry about the impact on Nigeria's crude oil exports (120). Nonetheless, deploying ZEEVs could lower emissions and remove the burden of petroleum subsidies Nigeria has to pay (120).
1.5 Nigeria's climate action
Nigeria is a party to the United Nations Framework Convention on Climate Change, which aims to limit the Earth's warming to 1.5 degrees Celsius (2.7 Fahrenheit). Nigeria commits to reducing carbon emissions by 20% by 2030 (121) and achieving net-zero carbon emissions by 2060 (122). Nigeria's commitment to global climate mandates includes policies like the Nationally Determined Contribution, National Climate Change Policy, National Climate Change Council, and Energy Transition Plan (123). However, Nigeria needs $1.9 trillion to achieve net-zero emissions in 2060, relying on international climate finance (123). The Conference of Parties (COP28) in Dubai agreed to four pillars: fast-tracking a just, orderly, and equitable energy transition from fossil fuel, fixing climate finance, focusing on people, lives and livelihoods, and underpinning everything with total inclusivity (124). At COP28, Nigeria secured over $400 million in commitment to the loss and damage fund and signed several commitments to establish solar panel and lithium battery manufacturing factories in Nigeria (125, 126). A lingering challenge remains that Nigeria is a fossil fuel-dependent developing country (FFDC) which rely on fossil fuel income and carbon intensive industries like the transport system. Nigeria's ability to successful transition will therefore depend on its capacity to diversify its assets and revenues (127). Nevertheless, Nigeria is already on the right tract for a just energy transition as the country has removed subsidies for fossil fuel consumption in 2023 (128).
2 Materials and methods
A comprehensive search of articles, abstracts and proceedings of conferences published in English in peer-reviewed academic journals and conferences was made. Electronic databases, including Medline, Embase, Scopus, Google Scholar, and African Journal Online (AJOL) were searched with no date restriction for ALL related works on the research interest. The keywords used for searches were “exposure to BTEX among petrol station attendants in Nigeria”; “exposure to volatile organic compounds at petrol stations in Nigeria”; “health hazards of petrol station attendants in Nigeria”; “knowledge of safety practices in filling stations in Nigeria”; “knowledge, attitude and practices on occupational health and safety in Nigeria's petrol stations”; “health effects of petrol fumes in Nigerian filling station attendants”; “petrol station attendants in Nigeria”; “symptoms among petrol station attendants in Nigeria”; “hazards among fuel station attendants in Nigeria” and “assessment of occupational safety and health in petrol stations in Nigeria”. When related articles were identified, the references cited by these articles were also searched for relevant articles.
Figure 2 depicts the diagrammatic sketch of the 81 reviewed articles. The first group was observational research that included studies of knowledge, attitude, and practices (KAPs) of occupational health and safety (OHS) in NPSs, for which questionnaires and checklists were used. The second was observational and analytical studies for which blood samples were taken for petrol fumes impacts on organ-systems of the Nigerian PSWs (haematologic, immunologic, hepatic, renal), or for which ultrasound scans were done, or physiologic (respiratory function indices) impacts were measured among the Nigerian PSWs. The third was those studies that measured ambient air quality in and around the NPSs.
Figure 2. A diagrammatic sketch of the reviewed 81 articles. SW, southwest; SS, southsouth; SE, southeast; NW, northwest; NC, northcentral; NE, northeast; OHS, occupational health and safety; NPS, Nigeria's petrol stations.
3 Results
3.1 Observational studies
Table 2 summarizes the findings of the observational studies.
Table 2. Summary of the observational studies.
Awareness of safety measures among PSWs varied from 63.2% in Sagamu (4) to 99.1% in Kaduna (131). The commonest safety measures in operations were signage of no-smoking in 92.4% (16) and fire extinguishers in 99% (135). Hand-washing after contact with petrol was also prominent in 73.5% of PSWs in Uyo (69).
Awareness of hazards among PSWs at the NPSs ranged from 24.4% in Benin (71) to 85.3% in Aba (70). Petrol fumes inhalation as a hazard among PSWs was recognized by 81% of the PSWs in Enugu (135), and by 7.4% of PSWs in Ile-Ife (129). Other hazards recognized were skin contamination by petrol (20%) (71), accidents at the petrol station (37.1%) (70), armed robbery (27.8%) (129), fuel spillage (90%) (15), and fire (94.4%) (129). In the Okafoagu et al. (16) study, PSWs recognize petrol fumes as a health hazard containing volatile organic compounds.
Of the health symptoms experienced by the PSWs, the common ones were headaches (53.6%) and low back pain (33.3%) (69), itchy eyes (48.2%) and headaches (22.4%) (129), and cough and difficulty in breathing (73). The work of Akodu et al. (130) was solely on the burden of low back pain (LBP) among PSWs in Lagos, and the majority (84.6%) experienced LBP over 12 months of working at the petrol stations. The majority (60%) of the respondents also acknowledged that prolonged standing was the activity that predisposed them to LBP (130).
Concerning awareness of personal protective equipment (PPE) among PSWs at NPSs, it was 25.4 and 30.7% in Sagamu (4) and in Uyo (69), respectively. Awareness about PPE availability was 75, 92, and 95.6% in Sokoto (16), Kaduna (131), and Benin (71), respectively. The use of PPE ranged from 7% in Uyo (69) to 89.4% in Aba (70). The common forms of PPE used were overalls (89.4%) (70) and boots (46.7%) (69). Two studies (70, 71) also reported that the regular use of PPE was dependent on workers' awareness of hazards (70), punishment for non-compliance with the use of PPE (70), educational status (71), and the number of years on the job (70, 71). Ahmed and his colleagues (15) in Minna also identified that safety standards are far better in petrol stations owned by major petroleum marketers (conglomerate) compared to petrol stations owned by independent petroleum marketers (IPMs). Lack of adequate staff training, accidents, and fire safety equipment maintenance was noted more commonly at petrol stations owned by IPMs (15).
The only qualitative study by Lawal in Ilorin (134) reported poor OHS management practices observed at the selected retail petrol stations (RPSs) and poor awareness and knowledge of health risks related to RPS among RPS owners. However, the public and environmental health officers know the health and environmental risks associated with RPSs. No statistically significant difference between the RPS employees and the general population's quality of life was noted on the SF-36 questionnaire.
3.2 Observational and analytical studies
Table 3 provides a synopsis of the observational and analytical studies. Among PSWs, Nnwanjo and Ojiako (144) in Owerri, Ogunneye et al. (150) in Ijebu-Ode, and Iyanda and Anetor (167) in Ibadan, reported elevated serum alkaline phosphatase (ALP), alanine aminotransferases (ALT) and aspartate aminotransferases (ASP). The serum liver enzymes also increased with years of exposure to petrol vapors (144, 150) and more among the female PSWs (181). Akinosun et al. (141) in Ibadan, on the other hand, reported a reduction of ALP among PSWs in their series.
Table 3. Summary of observational and analytical studies.
For most studies, the hematological indices were found to be lower among the PSWs compared to the controls that were not occupationally exposed to petrol liquid or vapors/fumes (142, 146, 153, 154, 158, 159, 162, 179). Contrariwise, Christian et al. (85) in Port-Harcourt, showed that white blood cells, granulocytes, lymphocytes, and monocytes were all elevated among PSWs compared to the controls. However, in Ibadan, Akintomiwa et al. (140) reported no significant difference in the blood levels of red blood cells, white blood cell, Hb and PCV between PSWs and the controls.
PSWs tended to have reduced pulmonary functions compared to the controls that were not occupationally exposed to petrol fumes/petroleum products (151, 155, 163, 171, 178). Anakwue et al. (168) described increased kidney echotexture among 21 of 36 PSWs in Enugu.
The four studies (136, 139, 143, 145) in Abeokuta, Southwest, described the effects of interventional 2 weeks ascorbic acid (500 mg daily) supplementation on some toxicities of chronic lead exposure in some occupationally exposed subjects including petrol station attendants. These studies reported that ascorbic acid supplementation can ameliorate chronic lead poisoning among occupationally exposed PSWs.
Umegbolu et al. (164) suggested the possibility of cancer risk in Awka, when the authors detected many micronuclei among 35 PSWs compared to controls not exposed to petrol. This risk was also found to increase beyond 2 years of exposure.
3.3 Air quality studies
Table 4 provides a summary of studies on air quality measurement. All the authors reported poor ambient air quality at the petrol stations. In addition, Olabisi (189) reported no known occupational health issues among the PSWs, although awareness of safety measures was poor at 10.0%. Oni and Ana (190) also reported a significantly lower mean peak expiratory flow rate (PEFR) among 100 PSWs in 20 petrol stations.
Table 4. Summary of air quality studies.
Only Ekpenyong et al. (68) in Uyo, measured and quantified BTEX in the breathing zones of female PSWs. Ekpenyong et al. (68) reported a higher mean concentration of BTEX compounds in female petrol attendants than in ambient air sampled a few kilometers from the gasoline stations. Ekpenyong et al. (68) also found that petrol vapors exposure significantly affected the menstrual cycle length and flow quantity. There were also persistent low serum oestradiol levels, and the mean benzene concentration among the PSWs was more than the threshold limit value for benzene (0.5 ppm). Okonkwo et al. (186) in Umuahia found that levels of volatile organic compounds, methane, carbon monoxide, nitric oxide exceeded the FEPA air quality guidelines. However, the particulate matters (PM1 and PM2.5) were found to be at concentrations within FEPA air guideline (193).
Lawal et al.'s (188) work in Kaduna, was a preliminary study to test the effectiveness of an improvised air sampler to capture VOCs and BTEX in ambient air around the petrol station. The researcher used commercially available activated charcoal as an adsorbent media, and they demonstrated the presence of BTEX in the ambient air of a petrol station, with the prospect of planning a more detailed study in the future.
4 Discussion
4.1 Occupational health and safety at Nigeria's petrol stations
The observational studies highlight that the knowledge, attitude, and practices (KAPs) of PSWs on workplace hazards, health problems, workplace accidents, safety measures, and PPE vary from one study setting to another. The observational and analytical studies suggest that exposure to petrol fumes/petroleum products of the PSWs results in adverse effects on the respiratory function indices and the hematologic, immunologic, hepatic, and renal systems of the PSWs. The air quality studies confirm the poor air quality of the NPSs, including the adverse effects of BTEX exposure on the reproductive system of female PSWs. Although the KAPs of OHS in NPSs vary from one study setting to another, generally, the consensus is that safety practices are poor and that awareness about hazards and PPE and using PPE is sub-optimal. The Nigerian PSWs are at an increased risk of exposure to BTEX, petrol fumes, and petrol liquid.
Possible reasons for poor safety practices and sub-optimal awareness about hazards and PPE, and the usage of PPE among PSWs in Nigeria include lack of adequate information about hazards at petrol stations and lack of knowledge about the capacities of PPE to reduce exposure to hazardous BTEX/petrol fumes/liquid petrol (69). Other reasons are inadequate training on safe practices before employment and ineffective law enforcement, which promotes the lackadaisical attitudes of employers toward OHS issues (131).
Although Ekpenyong et al. (68) document the toxicity of BTEX on menstruation and reproductive hormonal profiles, the researchers did not measure BTEX biomarkers that would have confirmed exposure to BTEX through multiple exposure pathways. Thus, their work suffered some drawbacks as workers' exposure to BTEX through the skin or gastrointestinal tract was not accounted for.
In Nigeria, because many filling stations fail to adhere to the stipulations of Nigeria's Department of Petroleum Resources (DPR), the regulatory body, an increasing number of PSWs are exposed to hazards at filling stations (129, 133). During the refueling of automobiles, the atmospheric concentration of gasoline vapor is between 20 and 200 ppm (194, 195). This amount is higher when a long queue of automobiles needs refueling (195), a common occurrence in Nigeria because of perennial fuel scarcity (4). Furthermore, exposure of the Nigerian PSWs to BTEX occurs from exhaust fumes from generator sets used in powering the petrol dispensing pumps. This is a common finding as the DPR requires that every filling station have one electric generator set for its normal operations (196). The need for a canopy over petrol pumps at the petrol station is another expectation of the DPR (196). Unfortunately, a canopy over the pumps increases the ambient flux of BTEX around the station (197). Moreover, the harsh economic situation in Nigeria forces most motorists to go about on near-empty petrol tanks with the attendant voluminous petrol fumes in the head-spaces when they come for refueling at the petrol stations (151, 171). In addition, Adeniyi (151) described a situation where petrol pump attendants are constrained to stay put by the vehicle as the vehicle tanks get filled, as most fuel pumps can only dispense petrol with the attendants holding the nozzles.
The effect of temperature on the vaporization of BTEX has been conflicting (52, 198, 199). While Periago et al. (199) and Kitwattanavong et al. (52) demonstrated that temperature was positively correlated to ambient BTEX concentrations in gasoline stations; Moolla et al. (198) reported a negative correlation between temperature and ambient BTEX concentrations in diesel station. Thus, although the concentration of BTEX is usually lower in warmer months (31, 41) and higher in colder winter months (31, 41), these findings may not be universal and many other variables have to be accounted for. Whereas, the cold temperature layer during winter hindered the dilution of BTEX and thus led to higher concentrations of BTEX in the atmosphere, while intense photochemical activity and dilution due to the increase in the mixing layer depth in summer led to lower concentrations of BTEX (41). Nigeria is in tropical Africa, with high temperatures for most of the year, hence, a strongly powered study that will test the effect of temperature and other meteorological conditions is warranted.
Lead (tetraethyl and tetramethyl lead) and BTEX are used as petrol antiknock and lubricating agents to improve machine efficiency (24). Although it was officially announced that lead had been phased out in Nigeria in 2004, the 2017 standard for Nigeria's gasoline still contains lead of 50 ppm and BTEX of 2% v/v (see text footnote 2). Most lead is emitted from motor vehicles as inorganic particles (200), and leaded gasoline causes more exposure to lead than any other known source (201). Furthermore, lead and BTEX in gasoline cause overlapping health hazards, including gastrointestinal and hematological disturbances, hepatic and renal damage, hypertension and neurological disorders (21, 200, 202). The acute and chronic health symptoms of lead and BTEX are indistinguishable from each other, and attribution would have to be done by specific measurements of lead and BTEX among occupationally exposed workers. Acute lead exposure may cause gastrointestinal disturbances (anorexia, nausea, vomiting, abdominal pain), hepatic and renal damage, hypertension and neurological effects (malaise, drowsiness, encephalopathy) that may lead to convulsions and death (203). Chronic lead exposure effects include hematological effects (anemia), neurological disturbances (headache, irritability, depression, lethargy, convulsions, muscle weakness, ataxia, tremors and impaired hearing), gastrointestinal disorders (abdominal colic), and kidney dysfunction (204). These symptoms overlap with those shown in Table 1, resulting from acute and chronic exposures to BTEX (43–46). Thus, the works of Alasia et al. (83), Bambgose et al. (84), Christian et al. (85), Emokpae and Oyakhire (86), Eze et al. (87), Obi et al. (88), and Onuegbu et al. (89) which assessed the association of blood levels of lead and some clinical and biochemical changes among workers occupationally exposed to lead should be interpreted cautiously, as confounding exposure to BTEX cannot be excluded. Nevertheless, while children are especially vulnerable to the neurotoxic effects of lead (204), BTEX are the most commonly exposed VOCs among workers at petrol stations (21, 205). In addition, compared to benzene, which the IARC has classified as human carcinogen Group 1 causing acute myeloid leukemia and acute non-lymphocytic leukemia (43), inorganic lead compounds are probably carcinogenic to humans (Group 2A) (206) and organic lead are not classifiable in human carcinogenicity (Group 3) (206). Thus, while efforts to completely phase out lead in gasoline in Nigeria continue, future research efforts on BTEX exposures at NPSs should be considered favorably, as benzene remains the most toxic chemical additive in gasoline (207, 208).
4.2 Challenges of safeguarding occupational health and safety at Nigeria's petrol stations
Safeguarding the OHS of workers at NPSs is dependent on two prerequisites. First, there will be regulations and policies to guide the OHS of workers at the petrol stations. Second, there would be efficient and effective enforcement modalities of regulations and policies on OHS. Regarding the OHS of workers in NPSs, the two prerequisites are sub-optimal (72, 209). The Nigerian constitution statutorily empowers the DPR to ensure compliance with the oil and gas industry's regulations, guidelines, and laws (196).
Furthermore, since August 2021, and backed by Nigeria's Petroleum Industry Act of 2021 (210), the Petroleum Products Pricing Regulatory Agency (PPPRA) and the Petroleum Equalization Fund Management Board (PEFMB) have been merged with the Midstream and the Downstream Divisions of the DPR to form the Nigerian Midstream and Downstream Petroleum Regulatory Authority (NMDPRA) (210). The former DPR now operates under the NMDPRA (210). The NMDPRA, known as “The Authority”, statutorily provides a legal, governance, regulatory and fiscal framework for the Nigerian Petroleum Industry (210). The NPSs are retail outlets for petroleum products and they operate under the Downstream Division of the NMDPRA. The objectives of the PIA are to provide for the safety standards to be observed during midstream and downstream petroleum operations; (b) regulate safety and occupational health in Nigerian midstream and downstream petroleum operations; (c) set out the permits, authorizations, and fees for such midstream and downstream petroleum operations; and (d) provide sanctions, penalties, and administrative fines for failure to comply with these Regulations (210).
Table 5 shows the DPR guidelines regarding the sitting and construction of petrol stations in Nigeria (196). The DPR introduced the Minimum Industry Safety Training for Downstream Operations (MISTDO) as part of the Safety Audit Clearance policy launched to drive safety in the downstream sector. MISTDO is the basic safety training that is compulsory for all workers in the downstream sector of the Nigerian oil and gas industry (211). Regardless of the extant legislation and regulations on OHS in Nigeria, the consensus by observers is that OHS still needs improvement (72). The enforcement of the DPR guidelines needs thorough institutional improvements (212, 213). Owners of petrol stations have refused to adhere to proper land uses characterized by careless constructions, abnormally chaotic locations of petrol stations in residential areas, and over-concentration of petrol stations in one part of the urban cities, infractions that pose significant hazards to the health of workers, motorists and the people residing in surrounding environments to the petrol stations (212, 213). The poor sitting conditions of Nigeria's petrol stations also cause traffic congestion, air pollution, and fire hazards (72, 214). The abysmal state of OHS in Nigeria is attributable to the poor enforcement of OHS regulations and the need for more content and scope of the extant OHS regulations (215, 216).
Table 5. The Department of Petroleum Resources guidelines on construction of petrol stations in Nigeria (196).
In general, the gravity of penalties stipulated by OHS laws in Nigeria is insignificant and cannot deter offenders from fouling the regulations (216, 217). For example, the penalty stipulated by the Workman's Compensation Act is as low as 2000 Naira (2.53 United States Dollars, at 2023 rates of 0.0013 USD to 1 Naira) or the premium payable for 1 year (whichever is greater) when an employer fails to insure the employees against death or injuries (217). Regarding the Midstream and Downstream Petroleum sectors, the penalty is stiffer. A licensee who fails to comply with any of the provisions of the safety regulations shall, in addition to the sanctions, fines and penalties contained in the Act, be liable to an administrative penalty of not more than USD 250,000 (210). Any permit or authorization granted to that licensee or holder may be suspended or revoked (210). In addition, a manager who fails to comply or ensure compliance with these Regulations is liable to an administrative penalty issued by the Authority of not more than N5,000,000, an equivalent of 6,314 USD (210).
Furthermore, Nigeria's slow and ineffective judicial process discourages workers from seeking redress in incidents that infract OHS (217). Moreover, because the labor supply often overshadows demands, employers tend to become overlords with a penchant for disregarding the extant regulation on OHS (217). This power imbalance also makes it difficult for workers to demand their rights in the workplace (217). Another barrier to enforcement is ignorance about workers' rights and privileges. Both employees and employers need to become more familiar with the Factories Act and other extant laws that define OHS, rights, privileges, and expectations at the workplace (217).
Apart from the DPR, other pieces of Nigerian legislation safeguard Nigerian workers' safety, health, and welfare at petrol stations. These legislations include the Constitution of the Federal Republic of Nigeria 1999, the Labour Act of 2004, the Factories Act of 2004, the Employee Compensation Act of 2010, the Minerals Oil Safety Regulation of 1999, and the Harmful Waste Act of 1990 (134, 217). However, regardless of these extant Acts, Laws, and Regulations on OHS in Nigeria, the consensus by reviewers is that the OHS of Nigerian workers is still poor, and by extension, this includes Nigerians working at petrol stations (72, 134, 217).
4.3 Factors that determine the vulnerability of petrol station workers to petrol/BTEX exposure at petrol stations
In occupational epidemiology, the vulnerability of PSWs' exposure to petrol fumes or petrol liquid or BTEX can be contextualized as a dependent outcome or variable (personal monitoring or biological markers of BTEX) and the independent but interrelated risk factors. These independent factors determine PSWs' exposure to chemical hazards, including petrol/BTEX. The literature review of studies on occupational exposure to petrol or other petrochemicals containing BTEX by the authors identify seven risk factors of petrol station workers that determine their vulnerability to petrol/BTEX exposure at petrol stations as shown in Figure 3.
Figure 3. The seven risk factors that determine the vulnerability of petrol station workers to petrol/BTEX exposure at petrol stations. OHS, occupational health and safety. *Presence of confounding environmental source of BTEX: means of transport to work (walk, bicycle, motorcycle, commercial vehicle, personal vehicle), time spent in gelling to work, exposure to tobacco smoke, alcohol consumption, household of the PSWs including beating and cooking activities (gas, kerosene, firewood, animal dung), building finishing: inside painted or not, household storage of petrol, paint, pesticides, fertilizers and herbicides, household use of generator set, household use of varnishes, finger nail polish, glues at home, cleansing agents, and shoe polish, engagement in other jobs apart from working at petrol stations (painter, vulcanizer, mechanics, farmer).
Table 6 depicts some studies that describe the risk factors that may determine the vulnerability of petrol station workers to petrol/BTEX exposure at petrol stations.
Table 6. Studies of risk factors that may determine the vulnerability of petrol station workers to petrol/BTEX exposure at the petrol stations.
Efforts to reduce human exposure to BTEX have included reducing BTEX emissions at petrol stations in Europe by adopting vapor recovery systems (VRS) and by avoiding vapor losses during fuel transfer (228); restricting benzene composition in gasoline in Europe to 1% (v/v) (18) and to 0.62% (v/v) in the United States (19); and by standardizing benzene concentration in ambient outdoor air in Europe to 5 μg.m−3 (229). Table 7 shows the OELs of some professional institutions and countries (61). Unfortunately, there are no known national standards for OELs to BTEX in Nigeria (16). Instead, Nigeria's National Environmental Regulations on Air Quality Control (230) has some air quality standards for criteria for pollutants and air toxics, as shown in Table 8. Thus, PSWs in Nigeria are continuously being exposed to a work environment that exposes them to unmitigated levels of BTEX/petrol vapors.
Table 7. Occupational existing limits of benzene, toluene, ethylbenzene and xylene of some professional institutions and countries (61).
Table 8. Ambient air quality standards for criteria pollutants and air toxics in Nigeria (230).
4.4 Protective strategies against exposure to BTEX/petroleum products at petrol stations
Providing protective and interventional strategies against BTEX exposure at the NPSs can adapt from the measures applied in other built environments (231). These strategies include administrative, environmental/engineering, and personal protective measures (231). Administrative controls are policies and procedures put in place and implemented by petrol station managers/DPR that will reduce the vulnerability of PSWs to BTEX exposure. Environmental controls at the petrol station focus on engineering strategies that collect and prevent BTEX and other vapors from escaping and polluting the atmosphere (vapor recovering), as well as those designs that destroy the collected BTEX and other vapors (vapor destroying). Vapor recovery occurs in two stages (227, 232). The first stage is when underground storage tanks are refilled by tanker trucks. The second stage is when motor vehicles' tanks are being refueled (227, 232). At both stages, gasoline vapors in the head-spaces of empty or partially empty storage tanks and vehicles' tanks rise and pollute the atmosphere as liquid petrol is transferred into the tanks (227, 232). USEPA Stage I recovers petrol vapors in the first stage using two hoses (227, 232). The first hose transfers gasoline from the tanker truck to the storage tank (227, 232). The second hose simultaneously collects gasoline vapors being displaced out of the storage tank and back to the empty tanker truck (227, 232). The displaced vapors can then be collected for incineration, converted to liquid, and returned to the storage tank (227, 232). USEPA Stage II is a balance recovery system that uses a vapor recovery nozzle with a guard at the root of the filling pipe and recovery holes on the filling nozzle pipe. The guard fits tightly to the vehicle's tank preventing the escape of displaced gasoline vapors from the head-space during refueling. The recovery holes return gasoline vapors into the underground tank. Stage II control cuts the escape of gasoline vapor emissions by up to 88–92% (227, 232).
Personal protection controls are used in high-risk environments and emergency scenarios as the last resort where administrative and environmental controls cannot adequately offer protection (231). Thus, while personal protection controls may be the most visible form of strategy (appearing at the 'tip of the iceberg), they are not the most important. Examples of personal protection include the use of PPE and personal hygiene. Figure 4 summarizes the strategies to control exposure to BTEX in Nigeria's petrol station-built work environment. Unfortunately, until a safer substance is available to serve as an alternative additive for petroleum products, physically removing (elimination) or replacing (substitution), BTEX cannot form an integral part of the hierarchy of controls of exposures to BTEX at this time.
Figure 4. Hierarchy of control measures to protect workers at petrol stations. PPE, personal protective equipment; DPR, department of petroleum resources, *while personal control may be at the “tip of the iceberg”, the environmental control at the base is far more important.
4.5 Research gaps and future research directions
Despite the available research on the OHS of PSWs at NPS, further research on BTEX exposure and pollution in Nigeria must be emphasized. Table 9 depicts some areas of research that need to be developed to improve public health safety from BTEX pollution in Nigeria.
Table 9. Highlights of future research areas and research focus on BTEX pollution in Nigeria.
Controlling air pollution from BTEX and other hazardous air pollutants is an essential component of OHS, which forms an integral part of attaining the Sustainable Development Goals (SDG) 3 and 11 (233), of which the WHO is the custodian (234). The targets of the SDG relevant to ambient air pollution include SDG target 3.9.1 (it calls for a substantial reduction in deaths and illnesses from air pollution) and SDG target 11.6.2 (it aims to reduce the environmental impact of cities by improving air quality) (234).
5 Conclusion
The available literature revealed that OHS knowledge, attitudes, and practices in NPSs vary from one Nigeria's study setting to another. Generally, the consensus is that safety practices, awareness about hazards and PPE, and the usage of PPE among PSWs failed to live up to expectations. The Nigerian PSWs are at an increased risk of exposure to BTEX, petrol vapor, and petrol liquid. Currently, regulatory bodies' effectiveness and accountability in enforcing OHS regulations in NPSs leave much to be desired. Understanding the OHS of NPSs would inform future initiatives, policies, and regulations that would promote the health and safety of workers at NPSs. However, future studies need to be conducted that will describe and safeguard PSWs and other Nigerians who are occupationally exposed to BTEX pollution. Controlling air pollution from BTEX and other hazardous air pollutants is an essential component of OHS and integral to attaining the Sustainable Development Goals (SDG) 3, 7, and 11.
6 Limitations of study
In this study, it is essential to remember that while studies on OHS at NPS are reported based on the six geopolitical regions of Nigeria, we need to be cautious in interpreting and drawing conclusions from them. It is essential to note that while the results of these studies are factual for the specific settings where they were conducted, caution in generalizing the results to the entire geopolitical region of Nigeria needs to be emphasized.
Author contributions
EA: Conceptualization, Data curation, Formal analysis, Methodology, Resources, Writing—original draft, Writing—review & editing. ZN: Conceptualization, Methodology, Resources, Supervision, Writing—review & editing. CW: Conceptualization, Funding acquisition, Project administration, Resources, Supervision, Writing—review & editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by the Petroleum Technology Development Fund, Nigeria (PTDF/ED/OSS/PHD/AEA/1831/20; 20PHD139, 2020). The PTDF did not participate in study design; in the collection, analysis, and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.
Acknowledgments
EA is an Overseas Scholar of the Petroleum Technology Development Fund (PTDF), Nigeria. The PTDF is hereby acknowledged.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Footnotes
1. ^Nigerian Industrial Standard (NIS 948-2017)(2017). Standard for Diesel Fuel (AGO). file:///D:/NIS-948-2017.pdf.
2. ^Nigerian Industrial Standard (NIS 116:2017). (2017). Standard for Premium Motor Spirit (Petrol). file:///D:/NIS-116-2017.pdf [accessed June 2, 2022].
3. ^Nigeria-The World Factbook (2023). Available online at: https://www.cia.gov/the-world-factbook/countries/nigeria/ (accessed January 2, 2023).
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Keywords: narrative review, BTEX exposure, cancer and non-cancer risks, petrol stations, Sustainable Development Goals, Nigeria
Citation: Anigilaje EA, Nasir ZA and Walton C (2024) Exposure to benzene, toluene, ethylbenzene, and xylene (BTEX) at Nigeria's petrol stations: a review of current status, challenges and future directions. Front. Public Health 12:1295758. doi: 10.3389/fpubh.2024.1295758
Received: 17 September 2023; Accepted: 02 February 2024;
Published: 25 March 2024.
Edited by:
Silvia Fustinoni, University of Milan, ItalyReviewed by:
Boris Johnson-Restrepo, University of Cartagena, ColombiaEmina Kristina Petrovic, Victoria University of Wellington, New Zealand
Copyright © 2024 Anigilaje, Nasir and Walton. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Emmanuel Ademola Anigilaje, ZGVtb2xhYW5pZ2lsYWplMiYjeDAwMDQwO2dtYWlsLmNvbQ==; ZW1tYW51ZWwuYW5pZ2lsYWplJiN4MDAwNDA7Y3JhbmZpZWxkLmFjLnVr; Christopher Walton, Yy53YWx0b24mI3gwMDA0MDtjcmFuZmllbGQuYWMudWs=
‡ORCID: Emmanuel Ademola Anigilaje orcid.org/0000-0002-1260-5387
Zaheer Ahmad Nasir orcid.org/0000-0002-9953-7144
Christopher Walton orcid.org/0000-0001-8443-1139
†These authors share first authorship