AUTHOR=Salmond Jennifer A. , Vardoulakis Sotiris , Kinney Patrick , Green Donna TITLE=Editorial: Cities in Lockdown: Implications of COVID-19 for Air Quality and Urban Environmental Health JOURNAL=Frontiers in Sustainable Cities VOLUME=4 YEAR=2022 URL=https://www.frontiersin.org/journals/sustainable-cities/articles/10.3389/frsc.2022.913629 DOI=10.3389/frsc.2022.913629 ISSN=2624-9634