TRAFFIC SOURCE EMISSION AND STREET-LEVEL AIR-POLLUTION IN URBAN AREASOF GUANGZHOU, SOUTH CHINA (PRC)

Street level air pollution due to traffic emission is a cause of conce rn in Guangzhou City. During the winter and summer of 1988, the traffi c-related air pollutant concentrations, wind field, traffic volume and vehicle speed were measured extensively in three types of street cany ons in Guangzhou City. Various types of motor vehicle emission in idle condition were measured and the composite emission factors of vehicle s were derived. The variation of traffic volume and vehicle speed in 2 23 main streets were also investigated. The annual air pollutant conce ntration levels of traffic source emission were calculated. Using CO a s a traffic emission tracer for air pollution on the street, the contr ibutions of traffic emission to street level air pollution were determ ined by the receptor method. Ground level air pollution in Guangzhou h as changed from coal combustion emission type into traffic source emis sion type. The average contributions of traffic source emission to the concentration of CO and zdNO(x) on the street in 1988 are about 87% a nd 67%. The most significant pollutant of ambient air quality that tra ffic source emission influences is NOx.