Air pollution index (API) was developed by USEPA in 1970s which was used for the daily air quality report and easy for the public to understand.

空气污染指数(API)是美国环保署于70年代研究开发的一种用于表示每日空气质量状况，并易于为大众理解的报告方法。

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These agencies collect data from monitoring stations around the city and calculate an Air Pollution Index (API) indicating the potential harm to human health, with a range of 1-500.

这些机构从分布在城市中的监测站收集数据，计算出空气污染指数(Air Pollution Index, API)。该指数在1 - 500之间，数值越高就表明空气状况对人体健康的潜在危害程度越大。

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