Potential source analysis and health risk assessment of black carbon aerosol in Tianjin City

YAO Qing; HAO Tian-yi; CAI Zi-ying; WANG Xiao-jia; HAN Su-qin

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China Environmental Science ›› 2020, Vol. 40 ›› Issue (12) : 5221-5228.

Air Pollution Control

Potential source analysis and health risk assessment of black carbon aerosol in Tianjin City

YAO Qing, HAO Tian-yi, CAI Zi-ying, WANG Xiao-jia, HAN Su-qin

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Abstract

Black carbon (BC) produced by incomplete combustion of fossil fuels and biofuels has an important impact on human health and climate change. Based on the continuous online observation data of Tianjin from 2010 to 2013, the seasonal distribution, potential sources and health effects of BC in the atmosphere of Tianjin were analyzed. The average BC aerosol concentration was (4.49±3.26)μg/m³, which was the highest in autumn, the second in winter and summer, and the lowest in spring. The diurnal variation characteristics of BC concentration in different seasons were similar, showing a bimodal distribution in the morning and evening. The peak value in the morning was higher than in the evening. The concentration of BC in night was higher than that in day in each season. Mixed layer thickness (MLT) and near-surface wind affected the spatial and temporal distribution of BC under horizontal and vertical directions. Concentration weight trajectory (CWT) analysis showed that Hebei, Shandong and Henan were the main potential areas affecting BC in Tianjin. In addition, northwest regions such as Inner Mongolia and northern Shanxi affected Tianjin in autumn. The lifetime cancer risk (CR) of adults and children in Tianjin was higher than USAEPA given acceptable risk level (10^-6), but the Hazard Quotien(HQ) was acceptable. Since the relative risk (RR) of respiratory mortality caused by high concentration of BC in autumn was 1.118, we need to pay close attention to the health risk of BC.

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black carbon / health risk / potential source / Tianjin

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YAO Qing, HAO Tian-yi, CAI Zi-ying, WANG Xiao-jia, HAN Su-qin. Potential source analysis and health risk assessment of black carbon aerosol in Tianjin City[J]. China Environmental Science. 2020, 40(12): 5221-5228

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