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It is also frequently used to compute an Air Quality Index AQI or a NowCast index either instead of or in addition to the direct PM 2.5 or PM 10 readings

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The AQI is a national system managed by the EPA that is used to measure and report air quality based on five major pollutants regulated by the Clean Air Act: particle pollution, ground-level ozone, carbon monoxide, nitrogen dioxide, and sulfur dioxide

Hygiene, London 32 : 293300 Corrao M, Guindon G, Cokkinides V, Sharma N