Characteristics and causes of an autumn heavy haze episode in the Yangtze River Delta, China

摘要

The organic matter, SO_4~(2-), NO_3~-, and NH_4~+were the dominant components of PM2.5. The high PM2.5 concentration was resulted from regional transport of air pollutants and the stagnant meteorological conditions afterwards. Vehicle emission and the biomass burning in northern Jiangsu Province were the largest primary sources of PM2.5.