据北京环卫工程集团有限公司运营管理部主任陈宝山表示称，这一现象的原因是因为公众对空气质量的认识日益加强。
Chen Baoshan, chief of the operations management department of Beijing Environment Sanitation Engineering Group Co. Ltd, attributed the decline to the growing public awareness of air quality.
几乎每个能想得到的职位，从环卫工程师到核物理学家，都有一定的规则和培训课程，但是，却没有特定的课程，教你如何成为一个老板。
There are rules and training programs for almost every conceivable job, from sanitation engineer to nuclear physicist, but no set curriculum teaches you how to be a boss.
做好环卫工作，与本工程无关的扬尘污染源禁止带入工地；
Environmental sanitation shall be well kept. Dust pollution sources irrelevant to this project are not admitted to this site.
做好环卫工作，与本工程无关的扬尘污染源禁止带入工地；
Environmental sanitation shall be well kept. Dust pollution sources irrelevant to this project are not admitted to this site.
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