Data.gov - Empowering People

TThis map shows the ozone levels across the U.S. Clicking on a dot brings up detailed information about the ozone measurements for that area over time. The ozone values shown are taken from dataset 8, "Clean Air Status and Trends Network (CASTNET); Ozone" released by the Environmental Protection Agency. The faceted browsing in this demo uses the Exhibit framework developed by the Simile Project at MIT.