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
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 we...
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Published in | Huanjing kexue Vol. 40; no. 3; p. 1052 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | Chinese |
Published |
China
08.03.2019
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Subjects | |
Online Access | Get more information |
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Summary: | 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 |
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ISSN: | 0250-3301 |