Articles | Volume 16, issue 15
Atmos. Chem. Phys., 16, 9891–9903, 2016
https://doi.org/10.5194/acp-16-9891-2016
Atmos. Chem. Phys., 16, 9891–9903, 2016
https://doi.org/10.5194/acp-16-9891-2016
Research article
08 Aug 2016
Research article | 08 Aug 2016

Oxidative capacity and radical chemistry in the polluted atmosphere of Hong Kong and Pearl River Delta region: analysis of a severe photochemical smog episode

Likun Xue et al.

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Short summary
The chemical budgets and principal sources of ROx and NO3 radicals during a multi-day photochemical smog episode in Hong Kong are elucidated by an observation-constrained MCM model. NO3 was shown to be an important oxidant even during daytime in a pollution case when high aerosol loading attenuated the solar irradiation. This study suggests the potential important role of daytime NO3 chemistry in polluted atmospheres under conditions with the co-existence of abundant O3, NO2, VOCs, and aerosols.
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