Articles | Volume 15, issue 19
Atmos. Chem. Phys., 15, 11165–11177, 2015
https://doi.org/10.5194/acp-15-11165-2015
Atmos. Chem. Phys., 15, 11165–11177, 2015
https://doi.org/10.5194/acp-15-11165-2015

Research article 07 Oct 2015

Research article | 07 Oct 2015

Evaluation of regional background particulate matter concentration based on vertical distribution characteristics

S. Han1,2, Y. Zhang1, J. Wu1, X. Zhang1, Y. Tian1, Y. Wang1, J. Ding1, W. Yan1, X. Bi1, G. Shi1, Z. Cai2, Q. Yao2, H. Huang2, and Y. Feng1 S. Han et al.
  • 1State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China
  • 2Research Institute of Meteorological Science, Tianjin, 300074, China

Abstract. Heavy regional particulate matter (PM) pollution in China has resulted in an important and urgent need for joint control actions among cities. It is advisable to improve the understanding of the regional background concentration of PM for the development of efficient and effective joint control policies. With the increase of height the influence of source emission on local air quality decreases with altitude, but the characteristics of regional pollution gradually become obvious. A method to estimate regional background PM concentration is proposed in this paper, based on the vertical characteristics of periodic variation in the atmospheric boundary layer structure and particle mass concentration, as well as the vertical distribution of particle size, chemical composition and pollution source apportionment. According to the method, the averaged regional background PM2.5 concentration in July, August and September 2009, being extracted from the original time series in Tianjin, was 40 ± 20, 64 ± 17 and 53 ± 11 μg m−3, respectively.

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It is crucial for studying regional-scale PM pollution and for the development of efficient joint control policy to improve understanding of the regional background PM concentration. Based on the vertical variation periodic characteristics of particle mass concentration, the atmospheric boundary layer structure, as well as the vertical distribution of chemical composition and pollution source apportionment, a method to estimate regional background PM concentration is proposed.
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