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Pinedale Online > News > March 2017 > Ozone Action Day issued for Saturday, March 11, 2017
Ozone Action Day issued for Saturday, March 11, 2017
by Wyoming DEQ
March 10, 2017

The Air Quality Division (AQD) of Wyoming’s Department of Environmental Quality (DEQ) is designating Saturday, March 11, 2017, as an Ozone Action Day 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 ozone 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. More information on ozone and the health effects of ozone are available at the Wyoming Department of Health website,

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

Yesterday, March 9, 2017, was an Ozone Action Day. The preliminary 8-hour maximums did not exceed the level of the 8-hour ozone National Ambient Air Quality Standard of 70 ppb. Please note these are preliminary values that have not completed the validation process. Preliminary data from yesterday include 8-hr values as follows: Big Piney – 42 ppb, Boulder – 44 ppb, Daniel – 44 ppb, Juel Spring – 43 ppb, Pinedale – 45 ppb.

Final data will be available on after validation is complete.

Pinedale Online > News > March 2017 > Ozone Action Day issued for Saturday, March 11, 2017

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