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Federal Classifications for 8-Hour Ozone Nonattainment Areas in California. Extreme (2024). Butte County. Severe-17 (2021). Western Nevada. Severe-15 (2019). Sutter Buttes. Serious (2013). Sacramento Metro Area. Moderate (2010). Central Mountain Counties. Marginal (2007).
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Federal Classifications for 8-Hour Ozone Nonattainment Areas in California Extreme (2024) Butte County Severe-17 (2021) Western Nevada Severe-15 (2019) Sutter Buttes Serious (2013) Sacramento Metro Area Moderate (2010) Central Mountain Counties Marginal (2007) Basic (2009 - 2014) San Francisco Bay Area Southern Mountain Counties Attainment/Unclassified San Joaquin Valley Eastern Kern Antelope Valley and Western Mojave Desert Coachella Valley Ventura South Coast Air Basin Air Basin Imperial County San Diego