In this paper, aerosol samples were collected with Andersen cascade sampler on typical polluted days at residential area in Hangzhou, China. The concentrations of sulfate, nitrate and ammonium in aerosol were analyzed by the ion chromatography. Results showed the concentrations of SO_4~(2-), NO_3~- and NH_4~+ on polluted days were 21.4, 31.2 and 10.8μg m~(-3) in fine particles, respectively, and were 1.3-1.7 times higher than on unpolluted days. SO_4~(2)-, NO_3~- and NH_4~+ in fine particles were the main threat of athlete health in the urban area of Yangtze River delta.
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