This page shows the latest 48-hour air quality forecast maps for the continental U.S. from the
NOAA-EPA National Air Quality Capability system. Users can choose the Map Area
(United States, Northeast, or Northwest), Variable (Ground level Ozone or Fine
Particulate Matter), and Initialization time from the selection menus. The forecasts
can be animated using the buttons and slider above the map. The forecasts update twice daily
for model runs beginning 0600 and 1200 UTC. These and other weather forecast maps are also
available on the UMaine Climate Change Institute's Climate Reanalyzer.