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The pollution indices and color codes available bellow follow the EPA graduation, as defined by AirNow and explained in wikipedia.
AQI Air Quality Health Implications
000-050 Good Air quality is considered satisfactory, and air pollution poses little or no risk.
051-100 Moderate Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
101-150 Unhealthy Members of sensitive groups may experience health effects. The general public is not likely to be affected.
151-200 Unhealthy Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
201-300 Very Unhealthy Health warnings of emergency conditions. The entire population is more likely to be affected.
300+ Hazardous Health alert: everyone may experience more serious health effects.