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Elucidating the impacts of aerosol radiative effects on surface O3 and PM2.5 for air pollution mitigation strategy in Delhi, India
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  • Lakhima Chutia,
  • Jun Wang,
  • Huanxin Zhang,
  • Lorena Castro Garcia,
  • Nathan Janechek
Lakhima Chutia
University of Iowa
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Jun Wang
the University of Iowa

Corresponding Author:jun-wang-1@uiowa.edu

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Huanxin Zhang
403 IATL
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Lorena Castro Garcia
The University of Iowa
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Nathan Janechek
403 IATL
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Atmospheric aerosol radiative effects regulate surface air pollution (O3 and PM2.5) via both the aerosol–photolysis effect (APE) and the aerosol–radiation feedback (ARF) on meteorology. Here, we elucidate the roles of APE and ARF on surface O3 and PM2.5 in the heavily polluted megacity, Delhi, India by using a regional model (WRF-Chem) with constraints from available and limited observation. While APE reduces surface O3 (by 6%) and PM2.5 concentrations (by 2.4% via impeding the secondary aerosol formations), ARF contributes to a 17.5% and 2.5% increase in surface PM2.5 and O3, respectively. The synergistic APE and ARF impact contributed to ~1 % of the total concentrations of O3 and PM2.5. Hence, the reduction of PM2.5 may lead to O3 escalation due to weakened APE. Sensitivity experiments indicate the need and effectiveness of reducing VOC emission for the co-benefits of mitigating both O3 and PM2.5 concentrations in Delhi.