CFR›Title 40›Chapter I›Part 87›40 CFR 87.1 Citation40 CFR 87.1CorpusDaily eCFRDisplayed edition2026-09-25Last updated2026-09-25 § 87.1 Definitions.Definitions apply as described in 40 CFR 1031.205. Next 87.2 § 87.2 Abbreviations.