实施20万亩平原造林工程,相当于用一年时间完成之前数年的绿化工程量PM2.5从一个社会热词成为政府工作报告名词,用时不过短短半年时间。这期间,北京市已经把实施平原地区20万亩造林工程作为了改善空气质量的重要措施之一。年造林20万亩,相当于新增133平方公里绿化面积,这是一个什么概 The implementation of 200000 mu of plain afforestation project, equivalent to one year before the completion of the number of years of greening projects PM2.5 from a social hot words to become the government work report term, but only a short period of six months time. During this period, Beijing Municipality has taken the implementation of 200,000 mu afforestation project in the plains as one of the important measures to improve air quality. Annual afforestation 200000 mus, the equivalent of an additional 133 square kilometers of green area, this is an outline