AirHead - Features a product guide and emissions calculator that will show you how much air pollution you create in a month compared to other people in the U.S. and around the world.
EPA's Ozone Home Page - Information on the ozone layer, methyl bromide, UV radiation and their effects on health and the environment.
The Ozone Hole Tour - Using computer graphics, satellite clips and lively scientific commentary, the tour explores the loss of ozone over Antarctica and what's being done to avert a growing environmental crisis.
South Coast Air Quality Interactive Map - Current hourly readings for the Los Angeles area, showing *precisely* how much dirt there is.
State of the Air - How clean is the air in your state? This American Lung Association report will tell you. Use the clickable map for a quick overview, or download the full report.