Graphical abstract. Credit: Environmental Science & Technology Letters (2022). DOI: 10.1021/acs.estlett.2c00322 During the first year of the COVID-19 pandemic, global road travel and commercial flight activity decreased by 50% and 60%, respectively, compared to pre-pandemic levels. During the lockdowns that cities imposed in the initial months of COVID, flight ...
View more: When air and road travel dropped during COVID, so did air pollution levels