| Title: | Effects of regional transport from different potential pollution areas on volatile organic compounds (VOCs) in Northern Beijing during non-heating and heating periods |
| Author(s): | Niu Y; Yan Y; Chai J; Zhang X; Xu Y; Duan X; Wu J; Peng L; |
| Address: | "MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China. Institute of Transport Energy and Environment, Beijing Jiaotong University, Beijing 100044, China; School of Environment, Beijing Jiaotong University, Beijing 100044, China. Electronic address: yanyulong@bjtu.edu.cn. Institute of Transport Energy and Environment, Beijing Jiaotong University, Beijing 100044, China; School of Environment, Beijing Jiaotong University, Beijing 100044, China" |
| DOI: | 10.1016/j.scitotenv.2022.155465 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Despite the adoption of air quality control measures, the influence of regional transport on volatile organic compounds (VOCs) pollution has gradually increased in Beijing. In this study, the whole observation period (September 24 to December 12, 2020) was divided into heating period and non-heating period to explore the impact of changing VOCs sources in different observation periods, and also classified into 'Type-N' and 'Type-S' periods both in non-heating period and heating period to explore the impact of regional transport from the northern and southern regions of sampling site, respectively. The average VOCs concentrations in northern Beijing during observation period were 22.6 +/- 12.6 ppbv, which showed a decrease trend in recent years compared with other studies. And higher VOCs concentrations were observed in Type-S than in Type-N period. The positive matrix factorization results showed that vehicular exhaust dominated VOCs (26.1%-33.7%), but coal combustion could not be ignored in heating period, when it was twice that in non-heating period. In particular, coal combustion dominated VOCs in southern trajectories (30.9%) in heating period. The analysis of concentration weighted trajectory showed that coal combustion was affected by regional transport from the southeast regions of Beijing, while vehicular exhaust was affected by urban and the southeast regions of Beijing. Regarding human health risks, the carcinogenic risks of benzene and ethylbenzene exceeded the acceptable cancer risk value (1 x 10(-6)), and were higher in Type-S than in Type-N period. The results indicated that regional transport from urban areas and the areas south of Beijing had a significant impact on VOCs in northern Beijing. Thus, targeted control measures for different potential pollution regions are important for controlling VOCs pollution in Beijing" |
| Keywords: | *Air Pollutants/analysis Beijing China Coal/analysis Environmental Monitoring Heating Humans Vehicle Emissions/analysis *Volatile Organic Compounds/analysis Health risk Potential pollution areas Regional transport Source apportionment Volatile organic com; |
| Notes: | "MedlineNiu, Yueyuan Yan, Yulong Chai, Jianwei Zhang, Xiangyu Xu, Yang Duan, Xiaolin Wu, Jing Peng, Lin eng Netherlands 2022/05/03 Sci Total Environ. 2022 Aug 25; 836:155465. doi: 10.1016/j.scitotenv.2022.155465. Epub 2022 Apr 29" |
