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Analysis of the Characteristics and Evolution Modes of PM 2.5 Pollution Episodes in Beijing, China During 2013

Author

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  • Ci Song

    (State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)

  • Tao Pei

    (State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)

  • Ling Yao

    (State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)

Abstract

Fine particulate matter (PM 2.5 ) has been recognized as a serious hazard linked to deleterious health effects. In this study, all PM 2.5 Pollution Episodes (PPEs) in Beijing during 2013 were investigated with hourly PM 2.5 observations from the Olympic Sport Center site, and then their characteristics and evolution modes analysed. Results show that 80 PPEs, covering 209 days, occurred in Beijing during 2013. Average PM 2.5 concentrations during PPEs were almost twice (1.86) the annual mean value, although the PPEs showed significant seasonal variations. The most hazardous PPEs tended to occur in winter, whereas PPEs with long duration occurred in autumn. The PPEs could be divided into six clusters based on their compositions of different pollution levels, which were strongly related to meteorological factors. We used series peaks of PM 2.5 concentrations to analyse the evolution modes of PPEs and found that the more peaks there were within the evolution mode, the longer the duration, and the higher the average and maximum PM 2.5 concentrations. Each peak within a PPE can be identified by “rise” and “fall” patterns. The “rise” patterns are widely related to relative humidity, whereas the “fall” patterns are affected principally by wind speed for one-peak PPEs and boundary layer height for multi-peak PPEs. The peak patterns cannot be explained fully by meteorological factors; however, they might also be closely related to complex and diversified human activities.

Suggested Citation

  • Ci Song & Tao Pei & Ling Yao, 2015. "Analysis of the Characteristics and Evolution Modes of PM 2.5 Pollution Episodes in Beijing, China During 2013," IJERPH, MDPI, vol. 12(2), pages 1-13, January.
    • Handle: RePEc:gam:jijerp:v:12:y:2015:i:2:p:1099-1111:d:44992
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    References listed on IDEAS

    as
    1. An Zhang & Qingwen Qi & Lili Jiang & Fang Zhou & Jinfeng Wang, 2013. "Population Exposure to PM2.5 in the Urban Area of Beijing," PLOS ONE, Public Library of Science, vol. 8(5), pages 1-9, May.
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