10Green is a website for visualizing changes in air quality over the U.S. and learning about the impacts on human health.

Air Quality Mapper is a page where users can explore annual means of county-level data onward from 1980 from the U.S. Environmental Protection Agency (EPA) for the Air Quality Index (AQI) and ten of the most important pollution measures, including ground-level ozone, particulate matter, sulfur dioxide, and others. Information on these pollutants, health standards, and human health impacts is available on the Pollutants & Standards page.

Air Quality Forecast has slider-animated maps showing the latest 48-hour ground-level ozone and particulate matter forecasts for the continental U.S. The forecasts update twice daily sourced from the NOAA-EPA National Air Quality Capability system.

10Green was redesigned in 2023 in a collaboration between the University of Maine (UMaine) Climate Change Institute and UMaine ASAP Media with funding from the Russell Grinnell Memorial Trust. The website was developed initially in 2010 through collaboration between the UMaine Climate Change Institute, UMaine School of Computing and Information Sciences, and Garrand. Funding for the original 10Green was provided in part by Heinz Endowments, University of Maine, UMaine Development Office, National Science Foundation, and Garrand.