CFR›Title 40›Chapter I›Part 61›Subpart E ContainsSections 61.50–61.56CorpusDaily eCFRDisplayed edition2026-06-04Last updated2026-06-04 Subpart E—National Emission Standard for Mercury Sections 61.50 § 61.50 Applicability. 61.51 § 61.51 Definitions. 61.52 § 61.52 Emission standard. 61.53 § 61.53 Stack sampling. 61.54 § 61.54 Sludge sampling. 61.55 § 61.55 Monitoring of emissions and operations. 61.56 § 61.56 Delegation of authority. Previous D Subpart D—National Emission Standard for Beryllium Rocket Motor Firing Next F Subpart F—National Emission Standard for Vinyl Chloride