A comprehensive evaluation of PM2.5-bound PAHs and their derivative in winter from six megacities in China: Insight the source-dependent health risk and secondary reactions

• DOI: 10.1016/j.envint.2022.107344
• Publication Date: 2022-06-11T09:01:34Z
• Authors: Jian Sun; Zhenxing Shen; Tian Zhang; Shaofei Kong; Hongai Zhang; Qian Zhang; Xinyi Niu; Shasha Huang; Hongmei Xu; Kin-Fai Ho; Junji Cao
• Keywords: Megacity; Apportionment

Atmospheric PAHs (polycyclic aromatic hydrocarbons) and their derivatives are a global concern that influences environments threatens human health. Concentrations of 52 the main in six Chinese megacities were measured winter 2019. The concentrations ∑PAHs (sum PAHs) ranged from 19.42 ± 7.68 to 65.40 29.84 ng m-3, with significantly higher levels northern cities (Harbin [HB], Beijing [BJ], Xi'an [XA]) than southern ones (Wuhan [WH], Chengdu [CD] Guangzhou [GZ]). Source apportionment was conducted by PMF model results showed coal combustion traffic emissions two dominant sources, which dominated cities, respectively. Biomass burning also characterized as crucial source extremely high contributions XA (42.5%). Assisted individual PAH results, source-depend TEQ (total BaP equivalent) incremental lifetime cancer risk (ILCR) firstly reported these cities. highlighted biomass both ILCR, underestimated apportionment. Secondary organic aerosol-derived demonstrated increase compared fresh three parameters, namely temperature, relative humidity, O3 multiple linear regression principal factors influencing secondary reactions winter. This study provides accurate health-orientated potential control measures mitigate toxicity formed PAHs, decrease uncertainty level traditional methods. revealed great progress air pollution government past 20 years, but still long way go formulate strict emission strategies environmental health-protective perspectives.