40 CFR § 1042.905 - Symbols, acronyms, and abbreviations.

---
identifier: "/us/cfr/t40/s1042.905"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1042.905 - Symbols, acronyms, and abbreviations."
title_number: 40
title_name: "Protection of Environment"
section_number: "1042.905"
section_name: "Symbols, acronyms, and abbreviations."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1042"
part_name: "CONTROL OF EMISSIONS FROM NEW AND IN-USE MARINE COMPRESSION-IGNITION ENGINES AND VESSELS"
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. 7401-7671q."
regulatory_source: "73 FR 37243, June 30, 2008, unless otherwise noted."
cfr_part: "1042"
---


# 1042.905 Symbols, acronyms, and abbreviations.

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

ABT Averaging, banking, and trading.

AECD auxiliary emission control device.

CFR Code of Federal Regulations.

CH<sub>4</sub> methane.

CO carbon monoxide.

CO<sub>2</sub> carbon dioxide.

cyl cylinder.

disp. displacement.

ECA Emission Control Area.

EEZ Exclusive Economic Zone.

EPA Environmental Protection Agency.

FEL Family Emission Limit.

g grams.

HC hydrocarbon.

hr hours.

IMO International Maritime Organization.

kPa kilopascals.

kW kilowatts.

L liters.

LTR Limited Testing Region.

N<sub>2</sub>O nitrous oxide.

NARA National Archives and Records Administration.

NMHC nonmethane hydrocarbon.

NO<sub>X</sub> oxides of nitrogen (NO and NO<sub>2</sub>).

NTE not-to-exceed.

PM particulate matter.

RPM revolutions per minute.

SAE Society of Automotive Engineers.

SCR selective catalytic reduction.

THC total hydrocarbon.

THCE total hydrocarbon equivalent.

ULSD ultra low-sulfur diesel fuel.

U.S.C. United States Code.

[81 FR 74154, Oct. 25, 2016]