AirNow logo

This is not the current AirNow website. To navigate to the current AirNow website, please go to www.airnow.gov. This website is historical material reflecting the AirNow website as it existed on September 12, 2018. This website is no longer updated and links to external websites and some internal pages may not work.

AIRNow Home
AIRNow Home Students Page Students page - For Teachers Students page - FAQs Students page - Links
There are many kinds of air pollution. The Environmental Protection Agency (EPA) calculates the Air Quality Index (AQI) for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution, carbon monoxide, sulfur dioxide, and nitrogen dioxide. Ozone and particle pollution are two common pollutants found in many parts of the country.

Learn about ozone and particle pollution by viewing the animations at the right. Click on "Smog City" below to see how individual choices, environmental factors and land use contribute to air pollution. The links above and at the lower right will provide students and teachers with more information about ozone, particle pollution, and the Air Quality Index.
Animations
Flash Player Required
Get Flash Player

Flash - How Ozone is Formed
How Ozone is Formed 00:35 sec
Flash Ozone- Good Up High Bad Nearby O3 - Good Up High,
Bad Nearby
02:34 min/sec
Flash "Particle Pollution"
Particle Pollution

02:05 min/sec
Smog City2 Web site
In Smog City you are in charge - see how individual choices, environmental factors and land use contribute to air pollution.
Air Quality Index - AQI
Good
Moderate
Unhealthy for
Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous