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.

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。

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Carson has a civil-engineering degree and spent time in Honduras working as a water and sanitation engineer.

NEWYORKER: Battle Plans