San Diego County is a nonattainment area for California ambient air quality standards for ozone. Pursuant to the California Clean Air Act, air districts in nonattainment areas are required to prepare and implement air quality strategies identifying all feasible emission control measures to locally attain state ozone standards by the earliest practicable date. Accordingly, the Regional Air Quality Strategy (RAQS) for San Diego County was developed and adopted in 1992, identifying all feasible control measures to reduce emissions of ozone precursors (oxides of nitrogen (NOx) and volatile organic compounds (VOC)) from stationary emission sources under the authority of the San Diego County Air Pollution Control District (District).
The California Clean Air Act also requires periodic RAQS revisions identifying the status of scheduled control measures and incorporating any new control measures determined feasible. Such evaluations are based on updated information regarding technology availability, emission reduction potential, and cost-effectiveness. Accordingly, the RAQS was revised in 1995, 1998, 2001, 2004, 2009 and 2016.
The 2022 RAQS Revision ensures continued compliance with the all-feasible-measures requirement. It also provides more ozone precursor emission reductions and reflects the District's tentative schedule of future regulatory activity. These possible control measures will be evaluated and, if warranted, developed into proposed rules for Board consideration in future years.