40 CFR § 1054.805 - What symbols, acronyms, and abbreviations does this part use?

---
identifier: "/us/cfr/t40/s1054.805"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1054.805 - What symbols, acronyms, and abbreviations does this part use?"
title_number: 40
title_name: "Protection of Environment"
section_number: "1054.805"
section_name: "What symbols, acronyms, and abbreviations does this part use?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1054"
part_name: "CONTROL OF EMISSIONS FROM NEW, SMALL NONROAD SPARK-IGNITION ENGINES AND EQUIPMENT"
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 59259, Oct. 8, 2008, unless otherwise noted."
cfr_part: "1054"
---


# 1054.805 What symbols, acronyms, and abbreviations does this part use?

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

ABT Averaging, banking, and trading.

cc cubic centimeters.

CFR Code of Federal Regulations.

CH<sub>4</sub> methane.

CO carbon monoxide.

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

EPA Environmental Protection Agency.

FEL Family Emission Limit.

g gram.

HC hydrocarbon.

hr hour.

kPa kilopascals.

kW kilowatts.

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

NMHC nonmethane hydrocarbons.

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

psig pounds per square inch of gauge pressure.

RPM revolutions per minute.

THC total hydrocarbon.

THCE total hydrocarbon equivalent.

U.S.C. United States Code.