40 CFR §63.61
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The substance methyl ethyl ketone (MEK, 2-Butanone) (CAS Number 78-93-3) is deleted from the list of hazardous air pollutants established by 42 U.S.C. 7412(b)(1).