The layer presents the California's current ambient ozone attainment status of county parcels, according to the California Air Resources Board's 2008-2010 ambient air sampling data (2011).
"Health and Safety Code (H&SC) section 39607(e) requires the Board to establish and periodically review area designation criteria. H&SC section 39608 requires the Board to use these criteria to designate areas of California as attainment, nonattainment, or unclassified for the State standards and to review these area designations annually. The Board makes area designations for ten pollutants: ozone, suspended particulate matter (PM10 and PM2.5), carbon monoxide, nitrogen dioxide, sulfur dioxide, sulfates, lead, hydrogen sulfide, and visibility reducing articles." (http://www.arb.ca.gov/desig/desig.htm).   Research has shown oil and gas development utilizing hydraulic fracturing can contribute to elevated concentrations of ambient ozone ((Utah Department of Environmental Quality, 2013; Olaguer, E. P. "The Potential near-Source Ozone Impacts of Upstream Oil and Gas Industry Emissions." Journal of the Air & Waste Management Association 62, no. 8 (2012): 966-77))
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