北京环境监测：【16时北京空气质量预报】2日夜间，低压控制，扩散条件不利。预计首污为PM2.5，空气质量指数110-130，3级，轻度污染。3日，前半天低压控制，扩散条件不利，午后外来沙尘影响北京，预计首污为PM10，空气质量指数100-120，3级，轻度污染。预计4日：2级；5日：2级；6日：1级。

发布平台:北京市环境保护监测中心
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