Abstract
In order to investigate the origins and health impact of PAHs/APAHs/NPAHs/OPAHs in PM2.5 at North China Plain (NCP) under the influence of Shengli oil field, PM2.5 samples were collected in winter, spring, summer and autumn from 2018 to 2019 at a background site in NCP, and 19 PAHs, 5 APAHs, 7 NPAHs, and 6 OPAHs were analyzed. The mean level of PAHs, APAHs, NPAHs, OPAHs were 9.13 ± 11.03, 1.33 ± 1.45, 0.23 ± 0.72, 0.48 ± 0.48 ng/m3, respectively. APAHs were the most abundant derivatives of PAHs, which indicated crude oil was an important source. Further, ratios of 1-MN/NAP showed that APAHs emitted from crude oil were relatively fresh. Significant correlations were found among PAHs and APAHs with similar rings. The positive matrix factorization model demonstrated that secondary formation (9.32%), oil industry emissions (32.68%), emissions from steel and vehicles (18.12%), biomass and coal emissions (30.00%), as well as petrogenic sources (9.88%) were the main sources of PAHs/APAHs/NPAHs/OPAHs. Through the analysis of concentration weighted trajectories, it was discovered that the southwestern region of Dongying was the primary potential source of the oil industry, while the Bohai Bay and Shandong coastal area was the primary source region for petrogenic sources. ILCR results indicated that it was highest in winter; adults (30–70 years) were people who had the highest cancer risks.
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