Vehicular traffic emits plenty of poisonous and harmful materials, which affects ecological
environment and human health in urban areas. Researchers of Key Laboratory of Shanghai
Climate Change Response for Urban Areas in Tongji University revealed source apportionment
of gaseous and particulate PAHs on Shanghai urban roads from traffic emission through tunnel
air sampling campaigns for a long time during 2011-2012, applying multiple scientific methods to
make a cross and compared analysis. Main sources of the gaseous PAHs included evaporative
emission of fuel, high-temperature (namely high-speed traffic) and low-temperature (namely
low-speed traffic) combustion of fuel, accounting for 50-51%, 30-36% and 13-20%, respectively.
Unburned fuel particles (56.4-78.3%), high-temperature combustion of fuel (9.5-26.1%) and
gas-to-particle condensation (12.2-17.5%) were major contributors to the particulate PAHs. The
result reflected, to a large extent, PAH emissions from the urban traffic of Shanghai. Improving
fuel efficiency and reducing non-combustion emissions of local vehicles will reduce over 50% PAHs
pollution caused by vehicle traffic, and will also greatly reduce contribution of traffic emission to
atmospheric PAHs in urban areas.
The important international academic journal Atmospheric Environment will publish the study results
in April 2015. The magazine is included by SCI/EI, and also one of the best professional journals in the
field of air research, mainly publishing papers related to the interactions between human and the
environment, including air contamination, micro climatology and pollution control countermeasures, etc.
If you are interested, please read the full article. DOI: 10.1016/j.atmosenv.2015.02.041.
Liu, Y., Wang, S., Lohmann, R., Yu, N., Zhang, C., Gao, Y., Zhao, J., Ma, L., 2015. Source apportionment of gaseous
and particulate PAHs from traffic emission using tunnel measurements in Shanghai, China. Atmos. Environ. 107, 129-136.