空气指数，就是根据空气中的各种成分占比，将监测的空气浓度简化成为单一的概念性指数值形式，它将空气污染程度和空气质量状况分级表示，适合于表示城市的短期空气质量状况和变化趋势。
假设空气指数抵达240，就会有学校恳求我们把竞赛转移到室内，或者痛快取消。
If the air is above 240, some of the schools will ask us to move football games indoors or cancel them altogether.
在北京，空气指数一直顽固地停留在“危险”区，而华北平原的工业城市已连续几天空气指数爆表。
Air indexes have stayed stubbornly in the "hazardous" zone in the capital, while the industrial cities of the north China plain have gone off the charts for several days running.
目前，污染物测量是在一个城市的多个不同地点进行测量的，然后数据会合计成一个数字(空气质量指数)最后在网站上每天发布一次。
Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website.
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