Winter Ozone

In 2005, the Air Quality Division recorded elevated ozone levels in the Upper Green River Basin. We know that the ozone exceedances are related to at least four factors: adequate amounts of precursor chemicals, snow cover, temperature inversions and low winds, and sunlight.

In the time since then, DEQ has been working to lower the ozone levels, conducting a series of studies on the area. You can learn more about ozone efforts from 2005-2017 in the Upper Green River Basin, in our report UGRB "The Power of Partnership." This page is intended to provide the public and industry with information about past and current work, background information related to the ozone issue, current ozone data, and technical documents and forms. 

Announcements

Primary Point of Contact to Improve Communication

In response to input received from the public, the DEQ is revising the plan to improve communication relating to ozone and the Upper Green River Basin. The AQD Ozone Team will be the primary point of contact and can be reached at ozone@wyo.gov or 307-777-7380.

 

Winter Ozone Season Communication

In response to input received from the public, the DEQ is revising the plan to improve communication during the 2019 Winter Ozone Season (January – March). Every month throughout the Winter Ozone Season, the DEQ will be communicating on topics relating to ozone and the Upper Green River Basin. 

 

Ozone Outlooks

The AQD will issue an Ozone Outlook notice for the Upper Green River Basin when weather conditions are forecasted to persist for multiple days that may be conducive for ozone formation.  AQD will issue an Ozone Outlook notice 48 hours in advance of the first day of the Ozone Outlook.  When an Ozone Outlook is issued, it is intended to assist the community to prepare accordingly (e.g., postpone non-essential activities until after or complete essential activities prior) for the days included in the Ozone Outlook to voluntarily reduce emissions. Please remember that current information on ozone levels at the AQD’s monitoring stations can be found at www.wyvisnet.com.

 

Ozone Action Day Notifications

AQD will provide the community with Ozone Action Day notifications when they are issued. AQD will issue an Ozone Action Day one day in advance when forecast weather conditions appear favorable for the formation of elevated ozone the following day. Ozone Contingency Plans should be implemented upon one-day notice and everyone is encouraged to voluntarily reduce emissions. 

Everyone is encouraged to implement contingency plans and continue to reduce emissions on the day after an Ozone Action Day.  A public-oriented Ozone Contingency Plan form is available for residents and small businesses in the UGRB.

Please remember that current information on ozone levels at the AQD’s monitoring stations can be found at www.wyvisnet.com.

Note: AQD winter ozone forecasting takes place only from January through March of each calendar year. 

For more information about Winter Ozone Updates, please call 1-888-WYO-WDEQ.


Program Resources

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