Ozone Action Day
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Ozone Action Day Program 

What is Ozone?

Ozone, the primary ingredient in smog, is when a chemical reaction between air pollutants and sunlight combine.  The ozone layer in the upper atmosphere protects you from the sun’s most damaging rays. While the ozone near the ground is a health hazard.  Ground-level ozone affects the respiratory system and can be very harmful to anyone surrounded by it.  The Ozone safety limits usually exceed safety limits from May through October when seasonal heat and sunlight are at their highest.

What are Ozone Action Days?

Ozone formation is also influenced by the weather, so it is possible to predict when atmospheric conditions will exist to form potentially high levels of ozone.  Meteorologists from the Texas Commission on Environmental Quality (TCEQ) can forecast a day in advance when ozone levels may be elevated.  If elevated levels are forecast, SETRPC will call an Ozone Action Day….a day when individuals should try to reduce ozone-producing activities.

Addtional Resources:

State:
Texas Commission on Environmental Quality (TCEQ)

Federal:
U.S. Environmental Protection Agency (U.S.EPA.)