银川市2000—2009年空气质量变化趋势分析

通过对2000—2009年银川市环境空气质量监测数据统计分析,结果表明,3种常规污染物NO2S,O2,PM10达二级以上日数分别占总天数的100%,92%,83.3%.影响银川市空气质量的首要污染物是PM10和SO2,分别占污染天数的68.1%,31.9%,平均每年因其造成三级以上污染的日数分别达57.1 d和26.7 d;3种污染物质量浓度整体呈逐年下降趋势,说明银川市近年来综合改善大气环境质量成效明显;主要污染物日变化规律基本与企业生产、市民出行和湍流变化时间相一致;SO2和NO2质量浓度冬季最高,夏季最低,PM10质量浓度冬季最高,春季次之,夏季最小.致污因素与银川市属于北方城市,冬半年利用锅炉或煤炉采暖导致煤烟型污染及易出现逆温,春秋多外来沙尘天气影响有关.

Analysis of Yinchuan air quality change trend from 2000 to 2009

The statistical analysis results of air quality monitoring data of Yinchuan City in 2000-2009 showed that the days of 2 or more pollutants level of three major items,SO2,NO2,PM10,were 100%,92%,83.3% to total polluted days respectively. The first important pollutants which influence Yinchuan air quality is PM10 and SO2, the days of 2 or more pollutants level were 68.1% ,31.9% in total polluted days, and the days of 3 or more pollutants level were 57.1 and 26.7 in every year. Downtrend of all concentration of three kinds pollutant every year indicates the effectiveness of air quality improvement in Yinchuan City in recent years, the daily variation rules of main pollutants are consistent with enterprise producing, citizen traveling and turbulent changing time. Pollutants concentration of SO2 and NO2 are the highest in winter, the lowest in summer. PM10 is the highest in winter, middle in spring, and the lowest in summer. Pollution factors is relevant to coal-burning pollution and temperature inversion form heating with boiler and coal stove in winter for half year in northern city Yinchuan, and sandstorm and dust weather in spring and autumn.