---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part52/subpartWW"
level: "subpart"
label: "Subpart WW"
heading: "Washington"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part52-subpartWW"
sections_count: 15
---

# Subpart WW — Washington

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs › Part 52 — Approval and Promulgation of Implementation Plans

## Sections

- [§52.2470. Identification of plan.](/cfr/40/52.2470.md)
- [§52.2471. Classification of regions.](/cfr/40/52.2471.md)
- [§52.2472. Reserved](/cfr/40/52.2472.md)
- [§52.2473. Approval status.](/cfr/40/52.2473.md)
- [§52.2474-52.2475. Reserved](/cfr/40/52.2474-52.2475.md)
- [§52.2476. Discretionary authority.](/cfr/40/52.2476.md)
- [§52.2477. Original identification of plan section.](/cfr/40/52.2477.md)
- [§52.2478-52.2494. Reserved](/cfr/40/52.2478-52.2494.md)
- [§52.2495. Voluntary limits on potential to emit.](/cfr/40/52.2495.md)
- [§52.2496. Reserved](/cfr/40/52.2496.md)
- [§52.2497. Significant deterioration of air quality.](/cfr/40/52.2497.md)
- [§52.2498. Visibility protection.](/cfr/40/52.2498.md)
- [§52.2499-52.2500. Reserved](/cfr/40/52.2499-52.2500.md)
- [§52.2501. Best available retrofit technology (BART) requirement for the Tesoro Refining and Marketing Company oil refinery—Better than BART Alternative.](/cfr/40/52.2501.md)
- [§52.2502. Reserved](/cfr/40/52.2502.md)