40 CFR § 52.477 - Control strategy: Particular matter.

---
identifier: "/us/cfr/t40/s52.477"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.477 - Control strategy: Particular matter."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.477"
section_name: "Control strategy: Particular matter."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
cfr_part: "52"
---


# 52.477 Control strategy: Particular matter.

(a) *Determination of Attainment.* EPA has determined, as of January 12, 2009, that the District of Columbia portion of the Metropolitan Washington, DC-MD-VA nonattainment area for the 1997 PM<sub>2.5</sub> NAAQS has attained the 1997 PM<sub>2.5</sub> NAAQS. This determination, in accordance with 40 CFR 52.1004(c), suspends the requirements for this area to submit an attainment demonstration and associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as the area continues to attain the 1997 PM<sub>2.5</sub> NAAQS.

(b) *Maintenance Plan and Transportation Conformity Budgets.* EPA approves the maintenance plan for the District of Columbia portion of the Washington, DC-MD-VA nonattainment area for the 1997 annual PM<sub>2.5</sub> NAAQS submitted by the District of Columbia for the entire Area on June 3, 2013 and supplemented on July 22, 2013. The MVEBs are based on a tiered approach: Tier 1 MVEBs are effective as EPA has determined them adequate for transportation conformity purposes; Tier 2 mobile budgets will become effective upon the completion of the interagency consultation process and fully documented within the first conformity analysis that uses the Tier 2 MVEBs.

Washington, DC-MD-VA PM Area's Tier 1 Motor Vehicle Emissions Budgets for the 1997 Annual PM NAAQS, (tpy)

| Type of control strategy SIP | Year | NO | PM | Effective date of SIP approval |
| --- | --- | --- | --- | --- |
| Maintenance Plan | 2017 | 41,709 | 1,787 | 11/5/14 |
|  | 2025 | 27,400 | 1,350 |  |

Washington, DC-MD-VA PM Area's Tier 2 Motor Vehicle Emissions Budgets for the 1997 Annual PM NAAQS, (tpy)

| Type of control strategy SIP | Year | NO | PM | Effective date of SIP approval |
| --- | --- | --- | --- | --- |
| Maintenance Plan | 2017 | 50,051 | 2,144 | Contingent and effective upon interagency consultation. |
|  | 2025 | 32,880 | 1,586 |  |

[79 FR 60084, Oct. 6, 2014]