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The Air Quality Index runs from zero to 500, with 500 being the most unhealthy.

空气质量指数的范围从0到500，上限500表示空气质量最不健康。

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Dr.Kausalya Pendyal tells her patients in Richmond, Virginia before they go outside to check the Air Quality Index - a U.S.government assessment of pollutants in the air.

VOA: standard.2010.08.04

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An unofficial reading from the US embassy's air quality index recorded over 500 early in the morning, but changed to 168 as of 13:00 (05:00 GMT).

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