Air pollution has been a primary environmental problem in city. The monitoring of air pollution also presses for resolving.
大气污染已成为城市的一个主要环境问题，大气污染的监测也就成为迫切需要解决的问题。
Air pollution has been a primary environmental problem in city. The monitoring of air pollution also presses for resolving.
大气污染已成为城市的一个主要环境问题，大气污染的监测也就成为迫切需要解决的问题。
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