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The original Acid Rain Program core regulations (40 CFR parts 72 through 78) were published on January 11, 1993. Since then, a number of revisions have been made to these rules based on lessons learned during implementation. In addition, substantive changes have been made to the part 75 continuous monitoring regulation and to the associated definitions in part 72, in order to adapt part 75 monitoring to other State and Federal air programs. However, these various rule revisions have, for the most part, been narrow in scope, focusing on critical needs in specific areas. This rule takes a more comprehensive approach by examining parts 72 through 78 in entirety, and then revising the definitions in part 72, updating test methods that are incorporated by reference, correcting known errors, and clarifying, removing and adding numerous provisions.