---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part51/subpartU"
level: "subpart"
label: "Subpart U"
heading: "Economic Incentive Programs"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part51-subpartU"
sections_count: 5
---

# Subpart U — Economic Incentive Programs

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs › Part 51 — Requirements for Preparation, Adoption, and Submittal of Implementation Plans

## Sections

- [§51.490. Applicability.](/cfr/40/51.490.md)
- [§51.491. Definitions.](/cfr/40/51.491.md)
- [§51.492. State program election and submittal.](/cfr/40/51.492.md)
- [§51.493. State program requirements.](/cfr/40/51.493.md)
- [§51.494. Use of program revenues.](/cfr/40/51.494.md)