The indoor-outdoor characteristics of water-soluble ion in PM2.5 in Tianjin wintertime.

Environmental Science and Pollution Research International
Baoqing WangZihui Ren

Abstract

The indoor and outdoor PM2.5 mass concentration, water-soluble ion by filter sampler was analyzed on December 3-21, 2015 during wintertime in Tianjin, China. The results indicate that high humidity conditions result in the accumulation of atmospheric pollutants and reduce atmosphere visibility. The I/O ratio for PM2.5 concentration in dormitory and lab are less than 1 in haze days. Indoor PM2.5 concentration increases rapidly with outdoor PM2.5 concentration increasing in haze days. The filtration factors of the dormitory and lab indicate nearly half of the outdoor PM2.5 enters indoor environment. The human activities in dormitory could cause more the formation of PM2.5 than those in lab. The concentration of SO42- is the highest ion in water-soluble ion for outdoor PM2.5. The SO42-, NO3-, NH4+, and Cl- are generated mainly by outdoor sources; however, the Na+, Ca2+, and Mg2+ are generated mainly by indoor sources. The NH4NO3, (NH4)2SO4, and NH4Cl accounts for 20.2~41.8%, 32.0~51.4%, and 6.4~10.6% of the total water-soluble ion in different indoor-outdoor environment. The total secondary aerosols including NH4NO3, (NH4)2SO4, and NH4Cl in PM2.5 are 28.3, 42.1, 28.2, 31.0, and 33.9% in outdoor environment for haze days, outdoor e...Continue Reading

References

Oct 4, 2005·The Science of the Total Environment·Xinhua WangJiamo Fu
Jun 6, 2006·Environmental Science & Technology·Yele SunZhisheng An
Jun 16, 2007·The Science of the Total Environment·Ling-Xiao YangWen-Xing Wang
Sep 20, 2007·Environmental Monitoring and Assessment·Kyung W KimSo Y Bang
Oct 7, 2009·Journal of Environmental Sciences (China)·Jihua TanJiamo Fu
May 15, 2015·Journal of Environmental Sciences (China)·Tingting HanTong Zhu

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Citations

Apr 3, 2019·International Journal of Environmental Research and Public Health·Guozhi CaoJinnan Wang
Apr 30, 2021·Environmental Monitoring and Assessment·Kai XinYuejing Gao

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