Intake Fraction of Mobile Sources in Beijing: Microenvironment Survey for Different Cohorts

摘要

In recent years, vehicle emission becomes a main source of urban air pollution in Beijing as the vehicle population grows rapidly and continuously. As a result of the 2 low emission height, the detail terrain and meteorological characteristics of urban streets will impact the disperse process of the exhaust pollutants, and cause local air pollution. The health risk of residents, passerby, and drivers will increase because of the high density of population and transport in urban area. Some researches show that the concentrations of particulate, NO_x, CO, and VOC are higher in some transport microenvironments such as bus stop, intersections, tunnel, and in vehicles. This will threaten the health of related urban residents.