An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Clean Air Markets

Documentation for Integrated Planning Model (IPM) Base Case v.4.10

Learn more about EPA Base Case v.4.10 assumptions, updates, changes, and enhancements.

Note: The following 5 appendices are in Microsoft Excel (XLS) file format.

Note: Additional appendices and the individual chapters of this documentation are presented below in PDF file format.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.