<P> The United States Environmental Protection Agency ( EPA ) has developed an Air Quality Index that is used to report air quality . This AQI is divided into six categories indicating increasing levels of health concern . An AQI value over 300 represents hazardous air quality and below 50 the air quality is good . </P>
<P> The United States Environmental Protection Agency ( EPA ) has developed an Air Quality Index that is used to report air quality . This AQI is divided into six categories indicating increasing levels of health concern . An AQI value over 300 represents hazardous air quality and below 50 the air quality is good . </P>
what level does the air quality index have to be above to be considered hazardous
what level does the air quality index have to be above to be considered hazardous
over 300
over 300