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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

Allowance Allocation Final Cross-State Air Pollution Rule Technical Support Document

This Technical Support Document (TSD) provides information that supports EPA‟s determination of unit-level allocations for existing and new units under the final Transport Rule. Section VI.D of the preamble discusses state budgets, and section VII.D discusses how the budgets are apportioned (i.e., allocated) to existing and new units under FIP program structure. This TSD provides additional information in support of unit level allocations and elaborates on the data and methodology used to arrive at the final allocations.

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