Fate of PM2.5-bound PAHs in Xiangyang,central China during 2018 Chinese spring festival:Influence of fireworks burning and air-mass transport

• 作者: Cheng Cheng Jiaquan Zhang Mingming Shi Qian Tian Shihua Qi Tianpeng Hu Weijie Liu Xinli Xing Yao Mao Zhanle Chen
• 来源期刊: 环境科学学报（英文版）
• 年，卷（期）: 2020,（11）
• 页码范围: 1-10
• 页数: 10页
• 语种: 英文

摘要

Variations of levels,possible source and air mass transmission were investigated for 16 USEPA priority-controlled PAHs in PM2.5 during 2018 Chinese Spring Festival (CSF) in Xiangyang City,central China which is the North-South pollutant airmass transport channel of China.Totally 37 samples were collected.Mass concentrations of Σ16PAHs for the PreCSF day (Pre-CSFD),during the CSF day (CSFD) and after the CSF day (Af-CSFD) are 33.78 ±17.68 ng/m3,22.98 ± 6.49 ng/m3,and 8.99 ± 4.44 ng/m3,respectively.High resolution samples showed that Σ 16PAHs are higher in the morning (06:00-11:00) or afternoon (11:30-16:30),than those in the evening (17:00-22:00) and at night (22:30-05:30),whereas the result is reversed during the CSFD.Fireworks burning can obviously increase the mass concentration of PAHs.Air mass trajectory indicated that Xiangyang is a sink area of pollutants for northwest and southeast,and the sources of the northeast and southwest.The air mass only can be transmitted out through northeast and southwest.It is effective for improvement of air quality in Wuhan and Hunan to control fireworks emission in Henan and local areas.Fireworks burning was an important source for PAHs during CSFD,biomass,coal combustion,and traffic emission were the main sources of PAHs for Pre-CSFD and Af-CSFD periods.The health risk on the CSFD was higher than the acceptable levels,especially during the intensive fireworks burning,the risk value far exceed 1.0 × 10-4,controlling buming fireworks is required.