U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

§ 59.685 - What symbols, acronyms, and abbreviations does this subpart use?

The following symbols, acronyms, and abbreviations apply to this subpart:

CFR Code of Federal Regulations EPA Environmental Protection Agency HC hydrocarbon NIST National Institute of Standards and Technology THC total hydrocarbon U.S.C. United States Code