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Pollution Status of the Particulate Matter(PM_(2.5)) and the Correlation of PM_(2.5) and Meteorological Factors during Heating Period in Xi'an City

LI Kai et al(School of Environmental and Municipal Engineering,Xi′an University of Architecture and Technology,Xi′ an,Shaanxi 710055)  
The variation trend of PM2.5 and PM10 concentrations in heating period and non-heating period as well as the correlation of PM2.5 and the synchronous meteorological factors during the heating period were analyzed.The results were as follows: PM2.5 and PM10 concentrations in heating period is markedly higher than in non-heating period,it is 1.85 and 1.46 times higher than in non-heating period in average,the proportion of PM2.5 to PM10 in heating period is higher than in non-heating period.PM2.5 concentration is influenced by several meteorological factors.It has negative correlation with radiation level,atmospheric pressure and visibility and has positive correlation with relative humidity and total cloud cover.
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