---
kind: "section"
citation: "40 C.F.R. § 87.31"
title: "40"
number: "87.31"
heading: "Exhaust emission standards for in-use engines."
url: "https://uscodex.org/cfr/40/87.31"
---

# §87.31. Exhaust emission standards for in-use engines.


Exhaust emission standards apply to in-use aircraft engines as described in [40 CFR 1031.60](/cfr/40/1031.60.md).


## Notes

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 87 FR 72350, Nov. 23, 2022, unless otherwise noted.