CFR›Title 40›Chapter I›Part 61›Subpart D ContainsSections 61.40–61.44CorpusDaily eCFRDisplayed edition2026-06-04Last updated2026-06-04 Subpart D—National Emission Standard for Beryllium Rocket Motor Firing Sections 61.40 § 61.40 Applicability. 61.41 § 61.41 Definitions. 61.42 § 61.42 Emission standard. 61.43 § 61.43 Emission testing—rocket firing or propellant disposal. 61.44 § 61.44 Stack sampling. Previous C Subpart C—National Emission Standard for Beryllium Next E Subpart E—National Emission Standard for Mercury