Abstract
Atmospheric hydrogen peroxide (H2O2) plays an important role in sulfate formation. To explore the contribution of the H2O2 oxidation pathway to atmospheric sulfate in winter in Beijing, three field campaigns of atmospheric H2O2 measurements were conducted at an urban site (Beijing) and a rural site (Wangdu) during the winter in 2016, 2017, and 2018. The H2O2 concentrations were usually around the detection limit (0.05 ppbv) during clean and severely polluted periods, whereas the highest H2O2 concentration of 0.90 ppbv was observed during moderately polluted periods. Obvious increases in the concentration of H2O2 could be observed after sunset at the urban site during each moderately polluted day, which was mainly attributed to transportation of H2O2-rich air from the rural areas in the south of Beijing. Coincident increases in the concentrations of H2O2 and PM2.5 were also observed during the day at high NO concentrations, implying that heterogeneous reactions might contribute to the formation of H2O2 und...
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