In America we use our automobiles so much, even for short hauls to the local school, despite realizing that we shouldn't contribute to air pollution.

在美国，我们过多地使用了汽车，即使是去很近的当地学校也要开车，尽管我们意识到我们不应该这样加重空气污染。

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So it is no surprise that Beijing has some of the worst air pollution of any big city on earth.

因此，北就的空气质量指数与世界各大城市相比，有些部份表现最差，也就不足为奇了

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So pollution restrictions that reduce ozone levels, especially in the rapidly growing polluted cities of Asia, could both clear the air and slow warming.

因此，控制污染减少臭氧水平，尤其是在污染快速增长的亚洲城市，既能清洁空气又可以减缓气候变暖。

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The air pollution is so awful in her Salt Lake City suburb that Francis keeps her daughter indoors on many days to prevent her cough from being aggravated.

NPR: Sickening Fog Settles Over Salt Lake City Area

Air pollution is another serious problem: the sky above the Strip is sometimes so dirty that you cannot see the mountains for the haze.

BBC: Discover life in the Nevada desert