Source Apportionment and Pollution Characteristics of PM 2.5 During the Two Heavy Pollution Episodes in the Winter of 2016 in a Typical Logistics City

• Published in: Huanjing kexue Vol. 40; no. 3; p. 1052
• Main Authors: Zhao, Xue-Yan, Yang, Wen, Wang, Jing, Liu, Ying-Ying, Bai, Wen-Yu, Xu, Yan-Ping, Wang, Xin-Hua, Bai, Zhi-Peng
• Format: Journal Article
• Language: Chinese
• Published: China 08.03.2019
• Subjects: positive matrix factorization (PMF); secondary particulate matter; logistics city; PM2.5; heavy pollution episode
• ISSN: 0250-3301

To characterize the chemical composition of PM and the formation of pollution during a heavy pollution episode in the winter in a typical logistics city, PM samples were collected from December 2016 to January 2017 at six sampling sites, and the water-soluble ions, elements, and carbon components were determined. The results showed that the average concentration of PM was (145.2±87.8) μg·m during the whole sampling period, of which 82% of daily average concentrations were above class Ⅱ of the national standards. The average concentrations of PM during the two heavy pollution episodes were (187.3±79.8) and (205.3±92.0) μg·m , which were 5.4 and 5.9 times, respectively, as high as class Ⅱ of the national standard. The results of the chemical composition of the PM showed that secondary water-soluble inorganic ions (SO , NO , and NH ) were the main components of PM in winter (51.2% of PM mass concentration), followed by organic matter (OM, 23.8%), and mineral dust (12.7%). Combined with the change trend and accum