How do we get our data for air quality in cities?



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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. Nationwide daily air quality forecasts provided by State and local Air Agencies for over 300 major U.S. cities:

    The Air Quality Index (AQI) for ozone is based on the 8-hour average ozone concentration, which is computed by averaging the measured hourly ozone concentrations over an 8-hr period. In real-time, eight hours of data are not available so a method was devised to estimate the 8-hr AQI from hourly ozone data using a mid-point approach. (Read on…

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