AUTHOR=Shaaban Muhammad , Hatano Ryusuke , Martínez-Espinosa Rosa María , Wu Yupeng TITLE=Editorial: Nitrogen in the Environment JOURNAL=Frontiers in Environmental Science VOLUME=9 YEAR=2022 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2021.829104 DOI=10.3389/fenvs.2021.829104 ISSN=2296-665X