上海市宝山区大气降尘污染时空变化特征

为了探讨上海市宝山区大气尘降污染的时空变化特征,对上海市宝山区冬、春、秋季3个时段的大气降尘采样和分析,利用单因子指数法和空气污染指数法对宝山区降尘污染进行评价.结果表明,宝山区降尘通量为3.4-52.5 g·m~(-2)·month~(-1),各个季节的降尘总量上,春季高于冬季,秋季最低;从区域受污染范围大小看,春季>冬季>秋季,其中春季48.7%的区域受到污染;冬季最高降尘污染等级是三个季节中最高的,达到重污染水平;工业区的降尘通量和降尘污染等级都显著高于其他功能区,是宝山最主要的降尘污染源.

TEMPORAL AND SPATIAL VARIATIONS OF ATMOSPHERIC DUST-FALL POLLUTION IN BAOSHAN DISTRICT OF SHANGHAI

To explore the pollution characteristics of dust-fall in Baoshan district of Shanghai, atmospheric dust-fall samples were collected and analyzed in three seasons of Baoshan district. The assessment of dust-fall pollution was performed with single-factor pollution index and air pollution index. Results showed that dust flux of Baoshan was 3.4-52.5 g· m~(-2) . month ~(-1) during the study period. Total dust flux in spring was higher than that in winter, and with the lowest dust flux in autumn. In terms of the dust-fall polluted areas, it was the following: spring > winter > autumn, with 48.7% of the observed area polluted in spring. As far as the polluting level was concerned, the highest level was present in winter, viz. the heavily pollution grade. Among the different functional areas, dust-fall flux and dust-fall pollution grade were the highest in industry area, indicating that the particle introduced by industry is the main source of air dust fall.