Significant Impact of a Daytime Halogen Oxidant on Coastal Air Quality.

ABSTRACT: Chlorine radicals (Cl^·) are highly reactive and affect the fate of air pollutants. Several field studies in China have revealed elevated levels of daytime molecular chlorine (Cl₂), which, upon photolysis, release substantial amounts of Cl^· but are poorly represented in current chemical transport models. Here, we implemented a parametrization for the formation of daytime Cl₂ through the photodissociation of particulate nitrate in acidic environments into a regional model and assessed its impact on coastal air quality during autumn in South China. The model could reproduce over 70% of the high Cl₂ level measured at a coastal site, revealing a discernible presence of Cl₂ and released Cl^· in coastal and adjacent areas

SUBMITTER: Dai J 

PROVIDER: S-EPMC11800395 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature