What are the six levels of Air Quality?

The environmental protection agency (EPA) Monitors the air quality index on a daily basis.The monitoring is done on the basis of the concentration of six major pollutants namely; SO2, NO2, Ozone, CO and particulate matter (both PM10 and PM2.5) and Lead. These pollutants are collectively known as Criteria Pollutants. Based on the concentration level of … Read more