Atmospheric PM_(2.5) and Total PCDD/Fs-WHO_(2005)-TEQ Level: A Case of Handan and Kaifeng Cities, China

Rong Zhao ； Kangping Cui ； Weiwei Wang ； Lin-Chi Wang ； Ping Yan

《Aerosol and Air Quality Research》 18卷4期 (2018/04) Pp. 994-1007

https://doi.org/10.4209/aaqr.2018.02.0040

摘要

From 2015 to 2017, the atmospheric PM_(2.5), the total PCDD/Fs-WHO_(2005)-TEQ concentrations, PM_(2.5)-bound total PCDD/Fs-WHO_(2005)-TEQ contents, and the gas-particle partitioning of PCDD/Fs in Handan and Kaifeng were investigated. In addition, a regression analysis of the air quality index (AQI) and total PCDD/Fs-WHO_(2005)-TEQ concentration was also studied. From 2015-2017, in Handan, the three-year average PM_(2.5) concentrations in spring, summer, autumn and winter were 66.9, 61.3, 74.8, and 138 μg m^(-3), respectively and averaged 85.3 μg m^(-3), which was 1.2 orders of magnitude higher than that in Kaifeng (71.1 μg m^(-3)). The three-year average PM_(2.5)-bound total PCDD/Fs-WHO_(2005)-TEQ content in spring, summer, autumn, and winter in Handan were 0.88, 0.28, 0.67, and 0.72 ng WHO_(2005)-TEQ g^(-1), respectively, and averaged 0.64 ng WHO_(2005)-TEQ g^(–1), which was 1.1 order of magnitude higher than that in Kaifeng (0.57 ng WHO_(2005)-TEQ g^(-1)). The three-year average fraction of gas phase total PCDD/Fs-WHO_(2005)-TEQ concentrations in spring, summer, autumn, and winter in Handan were 26.4%, 62.8%, 28.9%, and 3.34%, respectively, and averaged 30.4%. The three-year average fraction of gas phase total PCDD/Fs-WHO_(2005)-TEQ concentrations in Kaifeng (34.3%) was 1.1 order of magnitude higher than that in Handan (30.4%). Positive correlations between the AQI and the total PCDD/Fs-WHO_(2005)-TEQ concentration were found and their R^2 values in 2015, 2016, and 2017 were 0.929, 0.921, and 0.876, respectively. Therefore, the AQI can be used to roughly predict the level of total PCDD/Fs-WHO_(2005)-TEQ in ambient air through the use of a regression equation in these two cities.

關鍵字

AQI ； PM_(2.5) ； PM_(10) ； PCDD/Fs ； Phase distribution ； Regression analysis ； TEQ