Contributions of vehicle emissions to PM2.5 in roadside microenvironments
GAO Xue-qian1, WU Jian-hui1, ZHANG Hui-tao1, ZHANG Wen-hui1, DAI Qi-li1, GONG Pan2
1. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; 2. Wuhan Environmental Monitoring Center Station, Wuhan 430015, China
Abstract:To investigate the contribution of vehicle emissions to PM2.5 in roadside micro-environments in Wuhan, daily PM2.5 filter samples were collected from different roadside microenvironments (urban roadside, ring roadside) and background site from October 18th to October 27th, 2019 in Wuhan. Chemical components of the PM2.5 samples include elements, carbonaceous materials, and ions were determined. The motor vehicle exhausted PM2.5 were also collected and analyzed to provide localized source profile for the fitting of chemical mass balance (CMB) model. The results showed that the vehicle exhausted PM2.5 was dominated by OC and EC. Mass fraction of OC in PM2.5 from gasoline vehicles was 1.14 times that from diesel vehicles, while the EC from diesel vehicles was 1.08 times that from gasoline vehicles. The fine organic aerosol concentration in roadside was higher than the other sites and largely originated from vehicle exhausts. Concentrations of Fe, Si, and Al at the outer loop line roadside were higher than those at inner-loop urban roadsides. CMB source appointment results showed that the contribution of vehicle emissions to PM2.5 at the outer loop and inner-loop urban roadsides was 35.20% and 38.89%, respectively, nearly twice that at background site. The sources of PM2.5 varied with different roadside microenvironments, with vehicle emissions and secondary aerosol had a higher contribution at the inner-loop urban roadside than the outer loop roadside, while dust increased in importance at the outer loop roadside.
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