Volume 25 Issue 11
Nov.  2012
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Article Navigation >  Research of Environmental Sciences  > 2012  >  25(11): 1201-1207
GAO Jian, ZHANG Yue-chong, WANG Shu-lan, CHAI Fa-he, CHEN Yi-zhen. Study on the Characteristics and Formation of a Multi-Day Haze in October 2011 in Beijing[J]. Research of Environmental Sciences, 2012, 25(11): 1201-1207.
Citation: GAO Jian, ZHANG Yue-chong, WANG Shu-lan, CHAI Fa-he, CHEN Yi-zhen. Study on the Characteristics and Formation of a Multi-Day Haze in October 2011 in Beijing[J]. Research of Environmental Sciences, 2012, 25(11): 1201-1207.
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Study on the Characteristics and Formation of a Multi-Day Haze in October 2011 in Beijing

  • Chinese Research Academy of Environmental Sciences, Beijing 100012, China

  • Received Date: 2012-02-23
  • Rev Recd Date: 2012-09-18
  • Publish Date: 2012-11-25
    Abstract
  • The characteristics and formation of a multi-day haze episode that occurred in October 2011 in Beijing were studied based on analysis of the concentrations of the air pollutants SO2, O3, NO2, CO, PM10, PM2.5 and BC. During the observation period, haze occurred over 51.5% of the days, among which 13.6% were recognized as heavy haze episodes. During the haze, the concentration of PM1, PM2.5, PM10 and BC were found to be increased by more than 20%, and the ratio of PM1 over PM2.5 rose up to 78.7%. The relationship between PM mass concentration and visibility was analyzed, and the results showed that the appearance of haze was closely related to the mass concentration of fine and sub-micrometer PM. Study of the meteorological conditions, the time series of gaseous pollutants and the accumulation status of PM suggested that it was the frequently occurring cool pressure fields which promoted the formation of haze during the observation. Additionally, the huge amount of PM emissions in or around Beijing may be one of the major contributors of these episodes.

     

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