---
kind: "section"
citation: "40 C.F.R. § 90.1"
title: "40"
number: "90.1"
heading: "Applicability."
url: "https://uscodex.org/cfr/40/90.1"
---

# §90.1. Applicability.


The Environmental Protection Agency adopted emission standards for model year 1997 and later nonroad spark-ignition engines below 19 kW under this part. EPA has migrated regulatory requirements for these engines to [40 CFR part 1054](/cfr/40/part1054.md), with additional testing and compliance provisions in 40 CFR parts [1065](/cfr/40/part1065.md) and [1068](/cfr/40/part1068.md). The Phase 1 and Phase 2 standards originally adopted in this part are identified in [40 CFR part 1054](/cfr/40/part1054.md), appendix I. See [40 CFR 1054.1](/cfr/40/1054.1.md) for information regarding the timing of the transition to [40 CFR part 1054](/cfr/40/part1054.md), and for information regarding regulations that continue to apply for engines that manufacturers originally certified or otherwise produced under this part.


## Notes

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 86 FR 34372, June 29, 2021, unless otherwise noted.