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Ozone Sources

Since ozone comes from chemical reactions among ozone precursors in the atmosphere, the sources of ozone are actually the sources of the precursors.  Ozone precursors come from

  • Fuel combustion and evaporation associated with cars, trucks, buses and equipment;
  • Fuel combustion and evaporation associated with large stationary sources such as power plants, oil refineries, and factories;
  • Fuel combustion and evaporation from small stationary sources such as gasoline dispensing facilities, print shops and others;
  • Organic compound evaporation from consumer products such as paints, cleaners, and solvents; and
  • Fuel combustion and evaporation from off-road engines in aircraft, trains, construction equipment, agricultural operations, and lawn and garden equipment.

Unhealthy ozone levels occur when precursor emissions react in the presence of sunlight, warm temperatures and light winds.  Emissions from the above sources in the winter in the San Joaquin Valley do not typically produce high ozone levels due to diminished sunlight and cooler temperatures.  

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