Issue 1, 2024

Enhanced summertime PM2.5-suppression of O3 formation over the Eastern U.S. following the O3-sensitivity variations

Abstract

The suppression of ozone (O3) formation due to the presence of fine particulate matter (PM2.5) has recently been highlighted for further O3 pollution controls in regions that suffer high ozone concentrations. Here we derive multiple PM2.5-suppression factors for the Eastern United States (U.S.) major cities based on a non-linear fitting of the PM2.5 and O3 relationship from the multiyear surface observations. Our results show that these PM2.5-suppression factors are increasing with time and generally follow the transition of the O3-sensitive regime towards NOx-limited chemistry. A spatial discrepancy of this suppression factor is seen currently with a higher value in the Southeastern U.S. than in the Northeastern U.S. A spatial similarity between urban regions and their downwind locations was observed for the New York City metro area. This more extensive formulation of the PM2.5-suppression factor will further improve the ability of models to help guide O3 and PM2.5 concentration pollution controls.

Graphical abstract: Enhanced summertime PM2.5-suppression of O3 formation over the Eastern U.S. following the O3-sensitivity variations

Supplementary files

Article information

Article type
Paper
Submitted
21 mar 2023
Accepted
20 noy 2023
First published
21 noy 2023
This article is Open Access
Creative Commons BY license

Environ. Sci.: Atmos., 2024,4, 73-79

Enhanced summertime PM2.5-suppression of O3 formation over the Eastern U.S. following the O3-sensitivity variations

J. Zhang, J. Wang, A. Catena, M. J. Schwab, M. Ninneman, D. Felton and J. Schwab, Environ. Sci.: Atmos., 2024, 4, 73 DOI: 10.1039/D3EA00040K

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