Minor Source Emissions Inventory

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Check out the Iowa DNR's State and Local Emissions Inventory System (SLEIS), a web-based application that allows facilities to submit emissions inventory data.

Minor Source Emissions Inventory

Welcome to the Iowa Air Emissions Assistance Program's Minor Source Emissions Inventory Resource Page

The 2023 Minor Source Emission Inventory (MSEI) is required for facilities in the western third of the state.

The inventory is due May 15, 2024.

Questions? Concerns? Need Training?


We're here to help!

The IAEAP provides one-on-one training sessions for small businesses to meet with an IAEAP specialist. During the training, we can provide specific and accurate assistance to aid your facility in the completion of your emissions inventory, including:

  • Available tools and resources
  • Commonly asked questions
  • Calculation strategies
  • SLEIS Data Entry

Please note training sessions are limited to small businesses with 100 or fewer employees.


MSEI Assistance Call 319-273-8905

These resources and information have been developed by the Iowa Air Emissions Assistance Program, a program focused on training and educating Iowa small businesses with less than 100 employees. The Iowa Air Emissions Assistance Program is funded by the Iowa Department of Natural Resources. This information is intended solely as guidance, cannot be used to bind the Iowa Department of Natural Resources and is not a substitute for reading applicable statutes and regulations.