Laramie, WY – The state Department of Environmental Quality has issued an ozone advisory for southwest Wyoming for Wednesday.
It is the first ozone advisory issued for the Upper Green River Basin in Sublette County this winter.
Ozone is an air pollutant that can cause respiratory problems, especially for children, the elderly and people with existing respiratory conditions.
Officials say the ozone is caused by a combination of pollutants emitted from natural gas fields in southwest Wyoming and a combination of calm weather, snow cover and strong temperature inversions.
The state issued six ozone advisories last year.