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Pinedale Online > News > March 2023 > Ozone Action Day March 7
Ozone Action Day March 7
Air Quality Alert
by Wyoming Department of Environmental Quality Air Quality Division
March 7, 2023

The Air Quality Division has issued an Ozone Action Day for Tuesday, March 7, 2023 for the Upper Green River Basin Ozone Nonattainment Area. An Ozone Action Day is issued when forecasted weather conditions are favorable for the formation of ozone. Ozone appears to be elevated in the basin when there is a presence of ozone- forming precursor emissions including oxides of nitrogen and volatile organic compounds coupled with meteorological conditions such as strong temperature inversions, low winds, snow cover, and sunlight.

During the winter ozone season (January-March), everyone should take actions to reduce precursor emissions and ground-level ozone formation.

Ozone is an air pollutant that can cause respiratory health effects especially to children, the elderly, and people with existing respiratory conditions. People in these sensitive groups should limit strenuous or extended outdoor activities, especially in the afternoon and evening.

For more information on ozone and the health effects of ozone, please visit the websites for the Wyoming Department of Environmental Quality at and the Wyoming Department of Health at

Current information on ozone levels at the Air Quality Division`s monitoring stations at Daniel South, Pinedale, Boulder, Big Piney, and Juel Spring can be found at

Pinedale Online > News > March 2023 > Ozone Action Day March 7

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