CFR›Title 40›Chapter I›Part 61›40 CFR Part 61 Subpart D Citation40 CFR Part 61 Subpart DContainsSections § 61.40–§ 61.44CorpusDaily eCFRDisplayed edition2026-11-02Last updated2026-11-02 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. Authority42 U.S.C. 7401 et seq.Source38 FR 8826, Apr. 6, 1973, unless otherwise noted.