PM10 Concentrations and Its Characteristics in Yan’an
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Abstract:
By means of the PM10 data from 2006 to 2008 obtained at Yan’an, the concentration level and variation are analyzed, and their relationship with meteorological conditions is studied. The annual mean mass concentration of PM10 is 153 μg/m3 at Yan’an, which is two times higher than the limit value of 70 μg/m3 according to the Class 2 Standard of the National Ambient Air Quality Standard (NAAQS). The regional background level of PM10 has an average value of 109 μg/m3, which contributes significantly to the ambient PM10 level in Yan’an. The mass concentration of PM10 is the highest in spring, then in winter, autumn and summer. The number of days with the mass PM10 concentration exceeding the Class 2 limit value (150 μg/m3) of NAAQS accounts for 40% in the whole year and 66% in spring. The diurnal change of PM10 shows a double peak double valley distribution curve, and PM10 concentration has significant negative correlation with the diurnal variation of wind speeds. The scavenging efficiency of 1 mm rainfall on PM10 decreases successively in winter, spring, autumn and summer. The mass concentration of PM10 is the highest under westerly winds, but the highest accumulated contribution to PM10 is the southwest winds, about 40 to 50 μg/m3 higher than that in the other wind directions.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.