Articles | Volume 21, issue 20
Atmos. Chem. Phys., 21, 15809–15826, 2021
https://doi.org/10.5194/acp-21-15809-2021
Atmos. Chem. Phys., 21, 15809–15826, 2021
https://doi.org/10.5194/acp-21-15809-2021

Research article 22 Oct 2021

Research article | 22 Oct 2021

Improving the representation of HONO chemistry in CMAQ and examining its impact on haze over China

Shuping Zhang et al.

Model code and software

CMAQ (Version 5.3) USEPA https://zenodo.org/record/3585898

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Short summary
Six heterogeneous HONO chemistry updates in CMAQ significantly improve HONO concentration. HONO production is primarily controlled by the heterogeneous reactions on ground and aerosol surfaces during haze. Additional HONO chemistry updates increase OH and production of secondary aerosols: sulfate, nitrate, and SOA.
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