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Increased emissions of air pollutants in East Asia, especially from China, have contributed to PM_<2.5> pollution. A remarkably high PM_<2.5> concentration was recorded over central east China in Janu...ary 2013. In this study, both the GEOS-Chem chemical transport model and the REAS emission inventory were used to analyze 10 years (2004-2013) of aerosol variation data, including PM_<2.5> over East Asia. We carried out a detailed model evaluation of the impact of changes in NH_3, SO_2, and NO_x emissions in China on the PM_<2.5> concentrations in East Asia. The model successfully reproduced the variations in PM_<2.5> concentrations at EANET monitoring sites. The calculated concentrations of chemical species indicated that the atmosphere over the terrestrial area in East Asia contained enough NH_3 to react with sulfuric acid, but not nitric acid, outside of the summer months. A sensitivity analysis indicated that a reduction in NH_3 emissions decreased the formation of nitrate, while a reduction in SO_2 emissions increased the formation of nitrate, in China. Our results indicated that PM_<2.5> pollution in East Asia might not be well controlled without an appropriate strategy that includes the control of SO_2, NO_x, and NH_3 emissions.show more
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