2004年北京市沙尘天气对空气质量影响的对比分析

北京市环保局近几年的空气质量监测报告表明：PMIO污染显著，一直居高不下，是最主要的污染物，全年中其占首要污染物的天数超过90％；SO2的污染趋势已经得到控制；NO2的污染状况改善相对较小，但整体呈现缓慢下降的趋势。通过对2004年春季北京市发生的3次沙尘天气过程的分析与比较，结合北京市3月份的空气污染物浓度（或指数）的变化情况，总结了沙尘天气对空气质量的影响情况，为今后北京地区沙尘天气的空气质量预报提供参考。

Comparison Analysis of Dust Weather Influence on Air Quality over Beijing in 2004

According to the monitoring reports of recent years from the Beijing Environment Protection Bureau,PM10 remains in a high level,being the predominant air pollutant in over 90% days of a whole year.SO_2 pollution has been controlled to certain extent and NO_2 pollution is improved slightly with a slowly decreasing trend generally.Comparison and analysis is conducted on the three dust weather events happened in Beijing in spring of 2004,and in combination with the variation of the air pollutant concentrations(or index) in March in Beijing,the influence of dust weather on air quality in Beijing is discussed.The results provide references for air quality forecasting under dust weather in Beijing.