40 CFR § 63.62 - Redefinition of glycol ethers listed as hazardous air pollutants.
---
identifier: "/us/cfr/t40/s63.62"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 63.62 - Redefinition of glycol ethers listed as hazardous air pollutants."
title_number: 40
title_name: "Protection of Environment"
section_number: "63.62"
section_name: "Redefinition of glycol ethers listed as hazardous air pollutants."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "63"
part_name: "NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "57 FR 61992, Dec. 29, 1992, unless otherwise noted."
cfr_part: "63"
---
# 63.62 Redefinition of glycol ethers listed as hazardous air pollutants.
The following definition of the glycol ethers category of hazardous air pollutants applies instead of the definition set forth in 42 U.S.C. 7412(b)(1), footnote 2: Glycol ethers include mono- and di-ethers of ethylene glycol, diethylene glycol, and triethylene glycol R-(OCH<sub>2</sub>CH<sub>2</sub>)<sub>n</sub>-OR′.
Where:
n = 1, 2, or 3;
R = alkyl C7 or less; or
R = phenyl or alkyl substituted phenyl;
R′= H or alkyl C7 or less; or
OR′ consisting of carboxylic acid ester, sulfate, phosphate, nitrate, or sulfonate.
[65 FR 47348, Aug. 2, 2000]