Impact of Meteorological Parameters and Gaseous Pollutants on PM2.5 and PM10 Mass Concentrations during 2010 in Xi’an, China

Ping Wang; Junji Cao; Xuexi Tie; Gehui Wang; Guohui Li; Tafeng Hu; Yaoting Wu; Yunsheng Xu; Gongdi Xu; Youzhi Zhao; Wenci Ding; Huikun Liu; Rujin Huang; Changlin Zhan

doi:10.4209/aaqr.2015.05.0380

Impact of Meteorological Parameters and Gaseous Pollutants on PM2.5 and PM10 Mass Concentrations during 2010 in Xi’an, China

Ping Wang¹^,3, Junji Cao ¹^,2, Xuexi Tie¹, Gehui Wang¹, Guohui Li¹, Tafeng Hu¹, Yaoting Wu³, Yunsheng Xu³, Gongdi Xu³, Youzhi Zhao³, Wenci Ding³, Huikun Liu¹, Rujin Huang¹, Changlin Zhan⁴

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¹Key Laboratory of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China
²Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China
³Qiongzhou University, Sanya 722000, China
⁴School of Environmental Science and Engineering, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China

Received: May 31, 2015
Revised: August 4, 2015
Accepted: August 14, 2015
Download Citation: ||https://doi.org/10.4209/aaqr.2015.05.0380

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Cite this article:
Wang, P., Cao, J., Tie, X., Wang, G., Li, G., Hu, T., Wu, Y., Xu, Y., Xu, G., Zhao, Y., Ding, W., Liu, H., Huang, R. and Zhan, C. (2015). Impact of Meteorological Parameters and Gaseous Pollutants on PM2.5 and PM10 Mass Concentrations during 2010 in Xi’an, China. Aerosol Air Qual. Res. 15: 1844-1854. https://doi.org/10.4209/aaqr.2015.05.0380

HIGHLIGHTS

Terrain, meteorological parameters and precursors constrain PM_2.5/PM₁₀ spatiotemporally.
Relative Humidity is the main factor.
SO₂ is still the primary gaseous pollutant.

ABSTRACT

Mass concentrations of PM_2.5 and PM₁₀ from the six urban/rural sampling sites of Xi’an were obtained during two weeks of every month corresponding to January, April, July and October during 2010, together with the six meteorological parameters and the data of two precursors. The result showed that the average annual mass concentrations of PM_2.5 and PM₁₀ were 140.9 ± 108.9 µg m^–3 and 257.8 ± 194.7 µg m^–3, respectively. Basin terrain constrains the diffusion of PM_2.5 and PM₁₀ concentration spatially. High concentrations in wintertime and low concentrations in summertime are due to seasonal variations of meteorological parameters and cyclic changes of precursors (SO₂ and NO₂). Stepwise Multiple Linear Regression (MLR) analysis indicates that relative humidity is the main factor influencing on meteorological parameter. Entry MLR analysis suggests that SO₂ from local coal-burning power plants is still the primary pollutant. Trajectory cluster results of PM_2.5 at BRR indicate that the entrained urban pollutants carried by the westerly or winter monsoon forms the dominant regional pollution sources in winter and spring. Ultraviolet (UV) aerosol index verified the source and pathway of dust storm in spring.