EPA Launches the Environmental Indicators Gateway: "This gateway features information on EPA's environmental indicator projects. These projects provide information on environmental conditions and trends over a range of geographic scales and time periods. The Gateway provides summaries of the indicator projects and links to the related reports and Web sites developed by each project. You can search these summaries by geographic location, keyword, and topic. An environmental indicator is a numerical value that helps provide insight into the state of the environment or human health. Indicators are developed based on quantative measurements or statistics of environmental condition that are tracked over time. The gateway captures data from both national and regional reports."