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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Air quality forecast offers another improvement of air quality management following weekly and daily report.

空气质量预报是继周报和日报后城市空气质量管理的又一次飞跃。

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Analyze the main index, which include API, primary pollutant, air quality level, in 86 cities of china from Urban Ambient Air Quality Daily Report of 2006.

收集了2006年《重点城市空气质量日报》中中国86个重点城市空气质量主要分析指标——空气污染指数（A PI）、首要污染物、空气质量级别，并对数据进行统计分析。

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