The above Ozone Timeline will be updated soon to reflect changes in 2017.

The above graph shows ozone trends during the 2017 winter ozone season. The dates range from January 1, 2017 to March 22, 2017. During the third week in March, Sublette County lost a great deal of snow pack due to high temperatures.

Twelve ozone action days have been issued this year by the Air Quality Division of the Wyoming Department of Environmental Quality. Four of those having ozone levels exceeding environmental standard of an 8-hour 70 ppb level.

Chart was taken from http://www.wyvisnet.com