MONTHLY AIR POLLUTION IN THE UNITED STATES: 1990-2015

Select a Criteria Air Pollutant

All Criteria Pollutants
Carbon Monoxide (CO)
Lead (Pb)
Nitrogen Dioxide (NO2)
Ozone (O3)
Particulate Matter (PM2.5 / PM10)
Sulfur Dioxide (SO2)

The EPA monitors many air pollutants that are dangerous to both you and the environment. The data represented in the visualization represents concentration levels of all six official 'criteria pollutants.' The six featured pollutants are called 'criteria pollutants' because the Clean Air Act requires the EPA to set and monitor concentration standards for them. The EPA has air quality monitoring stations located throughout the United States that track concentration levels of these and other pollutants.