Variations in traffic-related polycyclic aromatic hydrocarbons in PM2.5 in Kanazawa, Japan, after the implementation of a new vehicle emission regulation  

作　　者：Wanli Xing Lu Yang Hao Zhang Xuan Zhang Yan Wang Pengchu Bai Lulu Zhang Kazuichi Hayakawa Seiya Nagao Ning Tang 

机构地区：[1]Graduate School of Medical Sciences,Kanazawa University,Kakuma-machi,Kanazawa 920-1192,Japan [2]Institute of Nature and Environmental Technology,Kanazawa University,Kakuma-machi,Kanazawa 920-1192,Japan [3]Institute of Medical,Pharmaceutical and Health Sciences,Kanazawa University,Kakuma-machi,Kanazawa 920-1192,Japan

出　　处：《Journal of Environmental Sciences》2022年第11期38-47,共10页环境科学学报（英文版）

基　　金：supported by the Bilateral Open Partnership Joint Research Projects of the Japan Society for the Promotion of Science, Japan (JPJSBP120219914);the Environment Research and Technology Development Fund (5-1951) of the Environmental Restoration and Conservation Agency of Japan;the CHOZEN Project of Kanazawa University, Japan;the cooperative research programs of Institute of Nature and Environmental Technology, Kanazawa University, Japan (21001)。

摘　　要：A three-year sampling campaign was conducted at a roadside air pollution monitoring station in the urban area of Kanazawa, Japan. Due to a new emission regulation, PAHs levels decreased over the sampling campaign, exhibiting values of 706 ± 413 pg/m^(3) in 2017, 559 ±384 pg/m^(3) in 2018, and 473 ± 234 pg/m^(3) in 2019. In each year, similar seasonal variations in PAHs levels were observed, with higher levels observed in winter and lower levels in summer. Among the PAHs isomer ratios, we observed that the ratio of benzo[b]fluoranthene(BbF) and benzo[k]fluoranthene(BkF), [Bb F]/([BbF] + [BkF]), and the ratio of indeno[1,2,3-cd]pyrene(IDP) and benzo[ghi]perylene(BgPe), [IDP]/([BgPe] + [IDP]), showed stability over the sampling campaign and were less affected by the new emission regulation, seasonal variations, and regional characteristics. When using the combined ratio ranges of 0.66-0.80([Bb F]/[BbF] + [BkF]) and 0.26-0.49([IDP]/[Bg Pe] + [IDP]), traffic emissions were clearly distinguished from other PAHs emission sources. Principal component analysis(PCA) and positive matrix factorization(PMF) were also performed to further analyse the characteristics of traffic-related PAHs. Overall, this study affirmed the effectiveness of the new emission regulation in the reduction of PAHs emissions and provided a combined range for identifying PAHs traffic emission sources.

关 键 词：Urban air pollution Traffic emission Roadside air pollution monitoring station Source apportionment 

分 类 号：X734.2[环境科学与工程—环境工程]