Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 10
Articles | Volume 26, issue 10
https://doi.org/10.5194/acp-26-6683-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-6683-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 10
Research article
 | 
18 May 2026
Research article |  | 18 May 2026

Contrasting air pollution responses to hourly varying anthropogenic NOx emissions in the contiguous United States

Madankui Tao, Arlene M. Fiore, Louisa K. Emmons, Jeffery R. Scott, Gabriele G. Pfister, Duseong S. Jo, and Wenfu Tang

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Short summary
Global models often rely on highly simplified emissions patterns that lack real-world hourly variations. Our study finds that representing their changes throughout the day substantially changes predicted air pollution levels. The impact can be large, comparable to a uniform 30 % reduction in total emissions, and varies significantly by region, especially between the eastern and western US and between urban and rural areas.
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