CFR›Title 40›Chapter I›Part 63›Subpart PPPP›Subject Group Emission Limitations ContainsSections 63.4490–63.4493CorpusDaily eCFRDisplayed edition2026-05-22Last updated2026-05-22 Sections 63.4490 § 63.4490 What emission limits must I meet? 63.4491 § 63.4491 What are my options for meeting the emission limits? 63.4492 § 63.4492 What operating limits must I meet? 63.4493 § 63.4493 What work practice standards must I meet? Previous Compliance Requirements for the Emission Rate Without Add-On Controls Option Compliance Requirements for the Emission Rate Without Add-On Controls Option Next General Compliance Requirements General Compliance Requirements