Emission Inventories

The Wyoming Department of Environmental Quality monitors and collects actual emissions data in accordance with federal regulations.  After review, this data is uploaded to the appropriate database.  Emissions data may be updated when new information is received.  Actual emissions data is made available by the Query Wizard.

All documents made available by the Emissions Inventory section of the DEQ-AQD are current as of the date posted.  Please be aware that these documents are updated as needed by the DEQ-AQD and can exceed 5 MB in size.  

Minor Source Emissions Inventories

Minor source emissions inventories are collected every three years in accordance with 40 CFR Part 51, Subpart A.  Forms, Excel spreadsheets, and other information for reporting actual emissions from minor sources can be accessed through the “Triennial Minor Source Emissions” link on the left.

Minor Source Oil and Gas Emissions Inventories

Oil and gas production sites are considered minor emission sources with inventories typically collected every three years. However, some oil and gas production site inventories are collected on an annual basis.  For production-related information, including mcf of gas or bbls of oil and water, visit the Wyoming Oil & Gas Conservation Commission website.

Annual and Winter Emissions inventories from minor source oil and gas facilities (including production sites) located in the Upper Green River Basin (UGRB) are collected on an annual basis.  Forms, Excel spreadsheets, and other information for reporting actual emissions from minor source oil and gas facilities in the UGRB can be accessed through the “Annual and Winter UGRB Emissions” link on the left. 

Emissions inventories from minor source oil and gas facilities (including production sites) located in the Southern Powder River Basin (SPRB) are collected on an annual basis.  Forms, Excel spreadsheets, and other documents for reporting actual emissions from minor source oil and gas facilities in the SPRB can be accessed through the “Annual Southern PRB Emissions” link on the left.

The AQD has developed emissions factor groups to assist operators in reporting actual emissions from minor source oil and gas facilities.  A link to an Excel pivot table with instructions for determining the emission factor group of an oil and gas facility is available under the “Forms” link on the left. 

If you have questions regarding these inventories, please contact:

Ben Way
Emissions Inventory Supervisor
ben.way@wyo.gov or 307-777-7017