AUTHOR=Puglisi Donatella TITLE=Editorial: Sensors for Air Quality Monitoring, Indoor and Outdoor JOURNAL=Frontiers in Sensors VOLUME=2 YEAR=2021 URL=https://www.frontiersin.org/journals/sensors/articles/10.3389/fsens.2021.813445 DOI=10.3389/fsens.2021.813445 ISSN=2673-5067