CFR›Title 40›Chapter I›Part 63›Subpart UUUUU›Subject Group Emission Limitations and Work Practice Standards ContainsSections 63.9990–63.9991CorpusDaily eCFRDisplayed edition2026-07-30Last updated2026-07-30 Sections 63.9990 § 63.9990 What are the subcategories of EGUs? 63.9991 § 63.9991 What emission limitations, work practice standards, and operating limits must I meet? Previous Continuous Compliance Requirements Continuous Compliance Requirements Next General Compliance Requirements General Compliance Requirements