Keller, C. A., M. Evans, K. E. Knowland, C. A. Hasenkopf, S. Modekurty, R. A. Lucchesi, T. Oda, B. B. Franca, F. C. Mandarino, M. V. D. Suarez, R. G. Ryan, L. H. Fakes, and S. Pawson, 2021. "Global impact of COVID-19 restrictions on the atmospheric concentrations of nitrogen dioxide and ozone." Atmospheric Chemistry and Physics, doi:10.5194/acp-21-3555-2021.

"The ACP Paul Crutzen Publication Award was created to recognize an outstanding publication in ACP that advances our understanding of atmospheric chemistry and physics. The annual award was created in honour of Paul Crutzen, Nobel Prize awardee and former director of the Max Planck Institute for Chemistry, who played a pivotal role in the creation of the journal 21 years ago."