Abstract
Ambient PM 10 aerosol samples were collected from Taiwan’s Taichung metropolitan basin between October 1997 and January 1998, and their chemical characteristics studied. The average mass concentration of PM 10 was 109.0 ± 54.1 μg/m 3. Carbonaceous materials, sulfate, nitrate, and ammonium were the most important contributors to the PM 10 component. On average, 64% of the PM 10 was made up of fine particles. During PM 10 episodes, average wind speed was 0.7 m/s and relative humidity was high, 83% on average, probably giving rise to stagnation of air pollutants and their entrapment close to the surface. With relative humidity <70%, NO 3 −, NH 4 +, SO 4 2−, carbonaceous materials, and PM 10 mass showed high correlation with maximum hourly average ozone (O 3M). Variation in atmospheric humidity may affect the gas-to-particle interactions of S and N species. The most significant contribution to PM 10 in the Taichung urban basin was from the photochemical formation of secondary aerosols and carbonaceous materials in the atmospheric environment.
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