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Data and Forecasts courtesy of:
Antelope Valley Air Quality Management District, Bay Area Air Quality Management District, California Air Resources Board, Imperial County Air Pollution Control District, Mendocino County Air Quality Management District, Mojave Desert Air Quality Management District, Monterey Bay Unified Air Pollution Control District, Placer County Air Pollution Control District, Sacramento Metropolitan Air Quality Management District, San Diego County Air Pollution Control District, San Joaquin Valley Air Pollution Control District, San Luis Obispo County Air Pollution Control District, Santa Barbara County Air Pollution Control District, South Coast Air Quality Management District, Ventura County Air Pollution Control District, Yolo-Solano Air Quality Management District
 AQI: Good (0 - 50)Air quality is considered satisfactory, and air pollution poses little or no risk.  AQI: Moderate (51 - 100)Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.  AQI: Unhealthy for Sensitive Groups (101 - 150) Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.  AQI: Unhealthy (151 - 200) Everyone may begin to experience health effects members of sensitive groups may experience more serious health effects.  AQI: Very Unhealthy (201 - 300)Health alert: everyone may experience more serious health effects.  AQI: Hazardous (301 - 500)Health warnings of emergency conditions. The entire population is more likely to be affected.  Action Day
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