California’s Air Districts
Appendix e– ozone air quality trends
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Appendix e– ozone air quality trendsThis table shows the percent above or below the current ozone NAAQS for each county over the comparison reporting periods of 2000-2002 and 2012-2014. This method uses the 3-year “design values” for each county, which is the metric used to assess attainment of the NAAQS. It takes into account both the level and the form of the federal standard for the county’s highest station, averaged over three years. A positive number means the county is above, or not in attainment of, the NAAQS and a negative number or zero indicates that the county is below, or in attainment of, the NAAQS for that period. The data in this table illustrate the changes that have occurred between the two reporting periods. Data may not be complete or finalized for some air districts and should be treated as preliminary and subject to change when validated. In addition, some air districts may have changed the number of stations or frequency of monitoring between 2000-2002 and 2012-2014 averaging periods. Please refer to your local air district for more specific information.
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