Our love affair with aboveground storage tank air emissions continues. The U.S. EPA finalized revisions to Chapter 7.1 of AP-42 – Organic Liquid Storage Tanks on November 20, 2019. As a result of these revisions, the EPA TANKS 4.09D emissions estimation software, which already had known errors and was no longer supported by USEPA, is now further out dated. Revisions that are now final include adjustments to the temperature equations, as well as new guidance for the following