The Air Pollution Index

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。

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。

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。