The research of air pollution characteristics in urban area over Zhejiang

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Journal of Nanjing University(Natural Sciences) ›› 2015, Vol. 51 ›› Issue (3) : 499.

Mao Minjuan1*, Meng Yanjun2, Qi Bing3

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Abstract

Based on observations data of atmospheric compositions, the characteristics of air pollution were investigated in urban area (mainly focus on Hangzhou) over Zhejiang province through the comparison and correlation analysis. The results showed that the increasing trends of the monthly average mass concentrations of PM2.5 and NO2 with 10 ?m.m-3 amplitude and the decreasing trends of PM10 and SO2 with drop slightly and 8 ?m.m-3 were present in Hangzhou from 2011 to 2013. The average correlation coefficients were 0.73, 0.83 and 0.74 between atmospheric extinction and mass concentration of PM1, PM2.5 as well as PM10, respectively. The contributions of 0.25-1.0 ?m and 1.0-2.5 ?m particles on atmospheric extinction were 66.4% and 23.2%, respectively, and larger than 0.25 ?m particles only 10.4%. Compared with Lin’an, the above-norm days of daily average concentration of NO2 was over 50, which is the important reason of heavier haze pollution in Hangzhou. The results also showed that NO3-, NH4+, and SO42- were the dominant water-soluble fractions in PM2.5, accounting for 52.66-96.61％ of the total water-soluble ion concentration in , and present NO3- > NH4+ > SO42- descending order, which was different from the condition of Beijing and Guangzhou with SO42- > NO3-. In addition, NO3- and NH4+ present the same seasonal variations of NO2 and good correlation each other, but SO42- was different to the seasonal variations of SO2. The highest concentrations of Na+ and Cl- were found in summer because dominant wind direction Marine aerosol to inland transportation, and the highest concentration of K+ was found in autumn which is a good indicator of straw burning in Yangtze River delta.

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Mao Minjuan1*, Meng Yanjun2, Qi Bing3. The research of air pollution characteristics in urban area over Zhejiang[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(3): 499

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