@Article{acp-21-3555-2021,
AUTHOR = {Keller, C. A. and Evans, M. J. and Knowland, K. E. and Hasenkopf, C. A. and Modekurty, S. and Lucchesi, R. A. and Oda, T. and Franca, B. B. and Mandarino, F. C. and D\'{\i}az Su\'arez, M. V. and Ryan, R. G. and Fakes, L. H. and Pawson, S.},
TITLE = {Global impact of COVID-19 restrictions on the surface concentrations of
nitrogen dioxide and ozone},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {21},
YEAR = {2021},
NUMBER = {5},
PAGES = {3555--3592},
URL = {https://acp.copernicus.org/articles/21/3555/2021/},
DOI = {10.5194/acp-21-3555-2021}
}