期刊
ENVIRONMENTAL POLLUTION
卷 274, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115883
关键词
PM2.5; Polycyclic aromatic hydrocarbons; Positive matrix factorization; Spatiotemporal variations; Geographic origins; Cancer risk
资金
- Tehran Urban Research and Planning Center [137/625229]
- Faculty of Natural ResourcesDepartment of Environmental Sciences, University of Tehran, Iran
A study in Tehran, Iran analyzed PM2.5-bound PAHs from daily samples collected at three urban sites over four seasons. Results showed seasonal variations in PAH concentrations, with different sources identified including diesel exhaust and gasoline exhaust. The study also assessed the cancer risk associated with PAH exposure.
PM2.5-bound PAHs were analyzed in a total of 135 daily samples collected during four seasons from 2018 to 2019, at three urban sites in Tehran, Iran. This study aims to investigate spatio-temporal variations, source apportionment, potential local and regional sources contributions and lung cancer risks associated with the 16 US EPA priority PAHs. PM2.5 concentrations ranged from 43.8 to 80.3 mu g m(-3) with the highest concentrations observed in summer. Total PAHs (TPAHs) concentrations ranged between 24.6 and 38.9 ng m(-3). Autumn period exhibited the highest average concentration (48.3 ng m(-3)) followed by winter (29.5 ng m(-3)), spring (25.9 ng m(-3)) and summer (16.1 ng m(-3)). Five PAHs sources were identified by positive matrix factorization (PMF) analysis: diesel exhaust, unburned petroleum-petrogenic, industrial, gasoline exhaust and coal/biomass combustion-natural gas emissions, accounting for 22.3%, 15.6%, 7.5%, 30.9%, and 23.6% of TPAHs, respectively. Site-specific bivariate polar (BP) and conditional bivariate probability function (CBPF) plots were computed to assess PM2.5 and TPAHs local source locations. CBPF pointed out that TPHAs sources are likely of local origin, showing the highest probability close to the sampling sites associated with low wind speed (<5 m s(-1)). The potential source contribution function (PSCF) and the concentration weighted trajectory (CWT) models were applied to investigate the long-range transport of PM2.5 and TPAHs. In addition to local sources contributions, Eastern areas were highly related to long-distance transport of PM2.5 and the Western areas showed the highest contribution of the total, medium molecular weight (MMW) (4 rings) and high molecular weight (HMW) (5-6 rings) PAHs. The upper bound of incremental lifetime cancer risk (ILCR) via inhalation exposure to PM2.5-bound PAHs was at a moderate risk level (3.14 x 10(-4) to 6.17 x 10(-4)). (C) 2020 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据