Molecular chlorine (Cl2) is an important yet poorly understood trace constituent of the lower atmosphere. Although a number of mechanisms have been proposed for the conversion of particle-bound chloride (Cl-) to gas-phase Cl2, the detailed processes involved remain uncertain. Here, we show that reaction of dinitrogen pentoxide (N2O5) with aerosol-phase chloride yields Cl2 at low pH (<2) and should constitute an important halogen activation pathway in the atmosphere.
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Article Synopsis
- - Chlorine radicals play a crucial role in atmospheric oxidation and pollutant behavior, but their interaction with nitrogen chemistry, specifically related to nitric oxide (NO), is not well understood.
- - This research provides evidence that increased levels of NO lead to daytime breakdown of nitrate and nighttime reactions between NO molecules, resulting in higher concentrations of chlorine-containing compounds after the Chinese Spring Festival.
- - The study emphasizes that the increase in nitrogen chemistry from NO significantly boosts chlorine reactions, ultimately enhancing the levels of ozone and the overall oxidative power of the atmosphere during winter days.
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