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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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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Companies, especially multinationals, based in these cities are spending tens of thousands of dollars to install air filtration systems and real-time pollution monitoring devices in their offices.

各个将总部设置在这些城市的公司(尤其是跨国公司)都花费上万美金，在办公室内安装空气过滤系统和实时污染监测设备。

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The finished product, if ever someone actually concocts one, could be applied across a variety of fields -- everything from pollution monitoring to medicine.

ENGADGET

The data used came from a daily monitoring of pollution levels recorded from 2007 through 2009, as collected by the Environmental Protection Agency (EPA).

FORBES: List: America's Most Polluted Cities

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