# 40 CFR § 97.3: Measurements, abbreviations, and acronyms

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-40-97.3

## Section

- **Citation:** 40 CFR § 97.3
- **Heading:** Measurements, abbreviations, and acronyms
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 40—Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS > PART 97—FEDERAL NOX BUDGET TRADING PROGRAM, CAIR NOX AND SO2 TRADING PROGRAMS, CSAPR NOX AND SO2 TRADING PROGRAMS, AND TEXAS SO2 TRADING PROGRAM > Subpart A—NOX Budget Trading Program General Provisions

## Text

Measurements, abbreviations, and acronyms used in this part are defined as follows:
Btu-British thermal unit.
CO2-carbon dioxide.
hr-hour.
kW-kilowatt electrical.
kWh-kilowatt hour.
lb-pounds.
mmBtu-million Btu.
MWe-megawatt electrical.
NOX-nitrogen oxides.
O2-oxygen.
ton-2000 pounds.

## Nearby sections

- [40 CFR § 97.1 § 97.1 Purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.1.md)
- [40 CFR § 97.2 § 97.2 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.2.md)
- [40 CFR § 97.3 § 97.3 Measurements, abbreviations, and acronyms.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.3.md)
- [40 CFR § 97.4 § 97.4 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.4.md)
- [40 CFR § 97.5 § 97.5 Retired unit exemption.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.5.md)
- [40 CFR § 97.6 § 97.6 Standard requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.6.md)
- [40 CFR § 97.7 § 97.7 Computation of time.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.7.md)
- [40 CFR § 97.10 § 97.10 Authorization and responsibilities of NOX authorized account representative.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.10.md)
- [40 CFR § 97.11 § 97.11 Alternate NOX authorized account representative.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.11.md)
- [40 CFR § 97.12 § 97.12 Changing NOX authorized account representative and alternate NOX authorized account representative; changes in owners and operators.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.12.md)
- [40 CFR § 97.13 § 97.13 Account certificate of representation.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.13.md)
- [40 CFR § 97.14 § 97.14 Objections concerning NOX authorized account representative.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.14.md)
- [40 CFR § 97.20 § 97.20 General NOX Budget Trading Program permit requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.20.md)
- [40 CFR § 97.21 § 97.21 Submission of NOX Budget permit applications.](https://www.frixlaw.com/law-library/statutes/ecfr-40-97.21.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-40-97.3. Check the current official text before relying on it. Not legal advice.