Emission Characteristics of Vehicle Exhaust in Beijing Based on Actual Traffic Flow Information

摘要: The basic data of traffic volume, vehicle type constitute and speed on road networks in Beijing was obtained fly modei simulation field survey. Based actual flow information and. emission factors with temporal spatial distribution features, inventory motor exhaust built the ArcGIS platform, meanwhile, characteristics pollutant emissions were analyzed. results showed that proportion passenger car higher than 89% each urban, highest suburban roads as well while pickup truck, medium heavy motorbus, tractor motorcycle also occupied a certain proportion. There positive correlation between intensity generally daytime nighttime, but diurnal variation trend PM not clear for nighttime highway. intensities urban area, south, southeast northeast areas near those western northern mountainous lower density network. ring highways had because volume.