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 Ozone Exceedances

How does this year compare with previous years? Compare 8-hour ozone exceedances between two years or multi-year periods for a city or county. The first plot shows the comparisions by MONTH. The second plot shows the comparisons by DAY based on cumulative counts. The third plot shows the comparisions by YEAR.

The data for this year are from AIRNow and are presented with baseline data from AQS for comparison only. The AIRNow data are not fully verified and validated through the quality assurance procedures monitoring organizations use to officially submit and certify data on the EPA AQS (Air Quality System) and, therefore, cannot be used to formulate or support regulation, guidance or any other Agency decision or position.


  •     -- or --
  • Single Year
    Multi-year Average From: To:
  • Single Year
    Multi-year Average From: To:
  • Use only monitors common to both time periods
    Use ALL monitors, even if they do not have data in both periods

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