CFR›Title 40›Chapter I›Part 72›Subpart E ContainsSections 72.50–72.51CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart E—Acid Rain Permit Contents Sections 72.50 § 72.50 General. 72.51 § 72.51 Permit shield. Previous D Subpart D—Acid Rain Compliance Plan and Compliance Options Next F Subpart F—Federal Acid Rain Permit Issuance Procedures