---
kind: "section"
citation: "30 C.F.R. § 72.501"
title: "30"
number: "72.501"
heading: "Emission limits for nonpermissible heavy-duty diesel-powered equipment, generators and compressors."
url: "https://uscodex.org/cfr/30/72.501"
---

# §72.501. Emission limits for nonpermissible heavy-duty diesel-powered equipment, generators and compressors.

- (a) -(b) [Reserved]
- (c) Each piece of nonpermissible heavy-duty diesel-powered equipment (as defined by [§ 75.1908(a)](/cfr/30/75.1908.md?p=a)), generator or compressor operated in an underground area of an underground coal mine must emit no more than 2.5 grams per hour of diesel particulate matter.
- (d) Notwithstanding the other provisions of this section, a generator or compressor that discharges its exhaust directly into intake air that is coursed directly to a return air course, or discharges its exhaust directly into a return air course, is not subject to the applicable requirements of this section.

## Notes

### Amendments

[66 FR 5704, Jan. 19, 2001, as amended at 66 FR 15033, Mar. 15, 2001; 66 FR 27866, May 21, 2001; 91 FR 38283, June 25, 2026]

### Source

Source: 66 FR 5704, Jan. 19, 2001, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811, 813(h), 957.

### Source

Source: 59 FR 8327, Feb. 18, 1994, unless otherwise noted.

### Amendments

[66 FR 5704, Jan. 19, 2001, as amended at 66 FR 15033, Mar. 15, 2001; 66 FR 27866, May 21, 2001; 91 FR 38283, June 25, 2026]