From Earth Science Information Partners (ESIP)

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The U.S. EPA, NOAA, NPS, tribal, state, and local agencies developed the AIRNow Web site to provide the public with easy access to national air quality information. AIRNow offers daily AQI forecasts by State and local Agencies for over 300 US cities and real-time ozone maps air iit Quality Index conditions covering 46 US States and parts of Canada.  +