名词
中文翻译：未净化的空气
同义词：
['dirty air', 'polluted air例句：1. The city was filled with unpurified air and smog.（这座城市充满了未净化的空气和雾霾。）']
例句：
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1. The city was filled with unpurified air and smog.
这座城市充满了未净化的空气和雾霾。
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2.Air pollution is a major concern for public health.
空气污染是公共卫生的一个主要问题。
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3. The government has introduced measures to improve the quality of unpurified air in the city.
政府已经采取措施改善城市空气质量。