Mouse operation, seen smoking on the mice which point, if the air pollution index too high, it is necessary to open ventilation windows.

鼠标操作，看到老鼠吸烟就点它，如果空气污染指数过高，要点击窗户打开通风。

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Air pollution in Beijing reached a high level of 99 on the Air pollution Index on Friday as a sandstorm from the northwest shrouded the capital in dust, the China News Service reported.

据中国新闻社报道，北京市区13日遭遇了来自西北方的沙尘袭击，当天该市污染指数一度达到99。

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The index assessed sustainability in 112 cities by looking at 18 environmental indicators — from air pollution to waste recycling to mass transit — for the years 2004-2008.

该指数通过观察2004-2008年的18项环境指标评估112座城市的可持续性，这些指标包括空气污染、污水回收利用、公共交通等。

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The government's Air Quality Index shows "unhealthy" pollution levels in much of Southern California.

CNN: Smoke a serious health threat as wildfires spread

He and his colleagues have launched a new air-pollution index that he says captures health risks better than the official index, which has not kept pace with the latest science.

ECONOMIST: An encouraging appointment addresses an enduring problem

Its report grades cities using, in part, the EPA's color-coded Air Quality Index, as well as its own weighting system that ranks the severity of pollution on a daily basis.

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