The database contains results of urban outdoor air pollution monitoring from almost 1100 cities in 91 countries.

这个数据库包含91个国家，几乎覆盖1100个城市的城市室外空气污染检测结果。

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For protecting air quality, air pollution monitoring is a foundation work, and it gradually displays its importance.

作为大气保护基础工作的大气环境监测也越来越显示出其重要性。

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During the recent red alert, pollution peaked at 508 on Tuesday, according to the US Embassy's air pollution monitoring service in Beijing.

据美国驻北京大使馆的空气污染监测服务中心数据显示，北京红色预警期间，污染在星期二达到峰值508微克。

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Marathon organisers are also monitoring the air pollution levels in London for any change caused by the volcanic eruption in Iceland.

BBC: Britain's Mara Yamauchi arrives in London for Marathon

Environmental health officers from Blaenau Gwent council told the meeting that monitoring suggested air pollution was not at a critical level, but this would continue.

BBC: Anger as waste fire in Nantyglo burns for 10 days

Eight thousand people a day die from air pollution but some simple preventative steps and increased monitoring could lessen the toll, according to a recently released report by Australia's Commonwealth Science Council.

CNN: Air pollution kills, but deaths can be prevented