Abstract
This review focuses on the concentrations of ionic species (Cl−, NO− 3, SO2− 4, Na+, NH+ 4, K+, Mg2+, and Ca2+) in ambient air in Asian countries during the years 1995–2009. The main likely source of the ionic species Cl−was the ocean while the source of NO− 3and SO2− 4was fossil fuel power stations, and that of Ca2+was terrestrial dust and alkaline particles from cement factory plants. The highest average concentrations of the ionic species Na+and Mg2+in total suspended particulates (TSP) were found in Hong Kong. The highest average concentrations of ionic species Na+, K+, and Ca2+in PM2.5 were found in Nanjing, China, while those of NO− 3and SO2− 4were found in Sha-Lu, Taiwan. The highest average concentrations of Cl−and NH+ 4were found in Beijing, China, while that of Mg2+was found in Shanghai, China.
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