2014年2月20日,北京遭雾霾袭击,空气质量为重度污染,启动黄色预警。21日,黄色预警升级为橙色预警,这是《北京市空气重污染预警方案》自去年公布后,首次启动空气重污染橙色预警。沉沉雾霾之下,治霾的紧迫感与日俱增。直到26日夜里一阵细雨,伴随着阵阵微风,带来清新空气的同时,才驱散了困扰北京乃至华北等地区长达一周的雾霾。自21日重污染日后的一周中,在市 February 20, 2014, Beijing was haze attack, the air quality was heavy pollution, start the yellow warning. On the 21st, the yellow warning was upgraded to orange warning, which is the first time that the “Orange Air Pollution Early Warning Plan of Beijing Municipality” was launched after last year’s announcement of the orange warning of heavy air pollution. Under the heavy haze, the sense of urgency to tackle haze is increasing day by day. It was not until the night of the 26th that when it was raining, with the breeze blowing and bringing fresh air, it dispersed the haze that plagued Beijing and even northern China for as long as a week. In the week after heavy pollution on the 21st, in the city