If you have questions regarding Monitoring, please contact:  
Cara Keslar, Air Quality Division Monitoring Section Supervisor, 307-777-8684.

Ambient Air Monitoring Data Submittal

Companies can submit their quarterly and annual Ambient Air Quality Monitoring Reports through the IMPACT system. Quarterly reports are due 60 days after the end of each quarter. To submit data for monitoring study purposes, please click here.

If you have any questions or issues with the portal, please contact Leif Paulson


Annual Network Plans

Every year, the Air Quality Division (AQD) develops an Annual Network Plan for the State’s ambient monitoring network as required by Title 40, Part 58.10 of the Code of Federal Regulations.  This page allows the public and other affected stakeholders (e.g., Federal Land Managers, local governments, industry, non-governmental organizations, etc.) with the opportunity to review and provide input on these plans.

Exceptional Events

There are occasional instances where a natural and exceptional occurring event impacts monitoring, causing a reading that is in exceedance with the National Ambient Air Quality Standards (NAAQS). This is called an Exceptional Event. 

In the case that this occurs, the Final “Treatment of Data Influenced by Exceptional Events” Rule (40 CFR 50.14) allows the state to request a data flag and justify the flag by submitting documentation showing that NAAQS exceedance would not have occurred in the absence of a natural/exceptional event.  

From the files below, you may access the Exceptional Event packets on public notice or submitted to United States Environmental Protection Agency (EPA) Region 8 since 2012.

Public Comments and Contact Information

Members of the public have the opportunity to comment on Exceptional Events. Please note that all comments must be sent by mail, fax, or DEQ's electronic comment portal, and they must be received prior to the comment due date listed next to each event. 

Please address all comments to:

Ms. Cara Keslar
Monitoring Section Supervisor 
200 W. 17th Street 
Cheyenne, WY 82002 

Comments may also be submitted online by going to the following address:

Additionally, if you would like to access packets submitted prior to 2012, please send an email request to  

We will update this page annually to show only the last 3 years of exceptional event packages.

Exceptional Events Currently Out for Public Comment

Reference Documents

This page hosts all Reference Documents that pertain to the AQD Monitoring Program. 

Wyoming Network Assessments

Every five (5) years, the AQD performs a statewide assessment of its ambient air monitoring network as required by Title 40, Part 58.10(d) of the Code of Federal Regulations. The Network Assessment uses historical monitoring data, emissions, meteorological data, and topographic data to perform a comprehensive review to determine: the current status of the monitoring network, where additional monitoring could be beneficial, and where monitoring could justifiably be removed pending the AQD’s evaluation of its internal resources and priorities. This page allows the public and other affected stakeholders (e.g., Federal Land Managers, local governments, industry, non-governmental organizations, etc.) with the opportunity to review and provide input on the Network Assessment.

The Air Quality Monitoring Section ensures the ambient air quality in Wyoming is maintained in accordance with the National Ambient Air Quality Standards. To carry out this goal, we operate and maintain a network of ambient air quality monitors and require industrial pollution sources to conduct source specific ambient air monitoring.

All ambient air quality data collected by the AQD is loaded into the U.S. Environmental Protection Agency’s Air Quality System database. Data is typically available within 90 days of the end of each calendar year’s quarter.

Gaseous Pollutant and Scenic Monitoring
Gaseous pollutant, meteorological, and scenic monitoring information can be viewed on the Wyoming Air Quality Monitoring Network. Quarterly and annual monitoring station reports can be accessed via the AQD’s Open Air Web Resource. Visitors to WyVisNet can access daily summary graphs of station data from the Historical Data Concentration located at the bottom of the webpage for each monitoring station. Validated data can be requested by submitting a records request.