State Standard Attainment for Ozone

In 1989, San Luis Obispo County was designated as nonattainment with the state health based standard for ozone. Ozone forming pollutants throughout San Luis Obispo County have been significantly reduced since that time. For the years 2000 through 2002, no violations of the State hourly ozone standard (0.09 ppm) were measured at any of the six community-based monitoring stations in SLO County. Based upon that record, the State Air Resources Board re-designated our County as attainment with the state health based ozone standard in January 2004.

On April 28, 2005, the California Air Resources Board (ARB) approved the nation's most health protective ozone standard with special consideration for children's health. The new 8-hour-average standard at 0.070 ppm will further protect California's most vulnerable population from the adverse health effects associated with ground-level ozone.  Based on monitoring data  San Luis Obispo County has once again been deemed nonattainment for the new ozone standard.

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