---
kind: "section"
citation: "40 C.F.R. § 1037.101"
title: "40"
number: "1037.101"
heading: "Overview of emission standards."
url: "https://uscodex.org/cfr/40/1037.101"
---

# §1037.101. Overview of emission standards.

- (a) You must show that vehicles meet the following emission standards:
  - (1) **Exhaust emissions of criteria pollutants.** Criteria pollutant standards for NOX, HC, PM, and CO apply as described in [§ 1037.102](/cfr/40/1037.102.md). These pollutants are sometimes described collectively as “criteria pollutants” because they are either criteria pollutants under the Clean Air Act or precursors to the criteria pollutants ozone and PM.
  - (2) [Reserved]
  - (3) **Fuel evaporative and refueling emissions.** Requirements related to fuel evaporative and refueling emissions are described in [§ 1037.103](/cfr/40/1037.103.md).
- (b) **The regulated heavy-duty vehicles are addressed in different groups as follows—**
  - (1) For criteria pollutants, vehicles are regulated based on gross vehicle weight rating (GVWR), whether they are considered “spark-ignition” or “compression-ignition,” and whether they are first sold as complete or incomplete vehicles.
  - (2) [Reserved]
  - (3) **For evaporative and refueling emissions, vehicles are regulated based on the type of fuel they use.** Vehicles fueled with volatile liquid fuels or gaseous fuels are subject to evaporative and refueling emission standards.

## Notes

### Amendments

[88 FR 4635, Jan. 24, 2023, as amended at 89 FR 29765, Apr. 22, 2024; 91 FR 7786, Feb. 18, 2026]

### Authority

Authority: 42 U.S.C. 7401—7671q.

### Source

Source: 81 FR 74048, Oct. 25, 2016, unless otherwise noted.

### Amendments

[88 FR 4635, Jan. 24, 2023, as amended at 89 FR 29765, Apr. 22, 2024; 91 FR 7786, Feb. 18, 2026]