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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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