Vehicle emission characteristics of gaseous pollutants in Guanzhong urban agglomeration
TAO Shuang-cheng1, DENG Shun-xi2, HAO Yan-zhao3, GAO Shuo-han1, XIONG Xin-zhu1, KONG Ya-ping1
1. China Academy of Transportation Sciences, Beijing 100029, China;
2. School of Environment Science and Engineering, Chang'an University, Xi'an 710064, China;
3. School of Automobile, Chang'an University, Xi'an 710064, China
This research calculated the emission factors of conventional and unconventional vehicle-emitted gas pollutants, based on the MOVES model with all parameters corrected and simulated to the situation of Guanzhong urban agglomeration. And the motor vehicle pollutant emission inventoryin 2012 of the research area was established, including the contributions from various motor vehicle types in each part of the area.The results showed that the amounts of conventional vehicle-emitted gas pollutants were 81.9kt, 454k, 1k and 4.2k tons of NOx, CO, NH3 and SO2, respectively. While the amounts of unconventional gas pollutants were 41.68kt, 0.57kt, 0.27kt, 0.04kt, 0.12kt, 0.95kt, 1.23kt and 0.04kt of NMHC, formaldehyde, acetaldehyde, propylene aldehyde, 1, 3-butadiene and benzene, CH4 and N2O, respectively. In addition, the shares of major vehicle-emitted gas pollutants in this area ranking from highest to lowestwere Xi'an(50%), Weinan (23%), Xianyang (including Yanglin) (12%), Baoji(10%), Tongchuan(5%), respectively. Furthermore, the shares of different types of vehicle varied significantly, among whichthe main source of NOx emission wereheavy trucks and medium trucks withcontributionaround 33.85% and 21.21%, respectively. While heavy trucks contributed the most to the emission of sulfur dioxide (~31.31%) and aldehydes(~30%). Specifically, small-size buses and motorcycles covered the most to the emission of CO, NMHC, 1,3-butadiene, benzene and methane, with 32.86%, 17.55%, 26.64%, 26.45%, 38.85% for the former and 32.64%, 55.21%, 43.29%, 49.04%, 30.97% for the later, respectively. And small-size buses and heavy trucks were the maincontributors to NH3 emission with 49.5% and 31.31%, respectively.
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