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- W2387604122 abstract "Daily average PM_(10)mass concentrations in Beijing and adjacent areas in August and September 2008 were significantly lower than those in 2006 and 2007.In this paper,the reasons for the low PM_(10) mass concentrations in Beijing during the Olympic Games and Paralympic Games period are studied by employing influence factor data and statistics,and using typical case diagnostic analysis with air pollution and meteorological data.Comparative analysis of wind speeds from 2006 to 2008 indicates that in Beijing from July to October 2008,the monthly average wind speed was lower than that in previous years,and the frequency of wind speeds stronger than 2 m/s was lower than in previous years.The wind speed conditions were not conducive to air pollution diffusion.The rainfall in Beijing in August 2008 was close to that in August 2005.However,PM_(10) mass concentrations in August 2008 were significantly lower than that in August 2005,suggesting that precipitation was not the reason for lower monthly average PM_(10)mass concentration.PM_(10) daily average mass concentration evolution processes under typical similar accumulative synoptic type backgrounds in Beijing during August and September from 2006 to 2008 were compared.PM_(10) daily mass concentration values and evolution curves in Beijing in 2008 were lower than those in previous years.Considering the above influence factors and the strict emission abatement measures,it is concluded that synoptic types and accompanying meteorological factors are the main causes of the daily average PM_(10) mass concentration fluctuations,while synchronous emission abatement of six provinces and cities of North China is the main factor that ensured the excellent air quality during the Olympic Games and Paralympic Games." @default.
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- W2387604122 date "2009-01-01" @default.
- W2387604122 modified "2023-09-25" @default.
- W2387604122 title "Evolution Characteristics and Causes of PM_(10) Mass Concentration in Beijing During the Olympic Games and Paralympic Games Period" @default.
- W2387604122 hasPublicationYear "2009" @default.
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