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The acute，growing public awareness of the social changes that had been taking place for some time was tied to tremendous growth in popular journalism in the late nineteenth century，including growth in quantity and circulation of both magazines and newspapers.

公众对一段时间内一直在发生的社会变化敏锐的、不断增强的意识，与19世纪晚期通俗新闻的巨大增长(包括杂志和报纸在数量和发行量上的增长)紧密相连。

A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals，vegetation，or materials adversely.

空气污染物的一个有用定义是：一种直接或间接加入到空气里的化合物，其数量足以对人类、动物、植物或物质产生不利影响。

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