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Environmental Protection Agency

Air Plan Approval; District of Columbia, Maryland, Virginia; Determination of Attainment by the Attainment Date and Clean Data Determination for the Washington, DC-MD-VA Nonattainment Area for the 2015 Ozone National Ambient Air Quality Standards

Published April 4, 2025. Takes effect May 5, 2025. printed at 90 FR 14730. amending 40 CFR 52.

In plain English

This signs off on a clean air plan. It covers the Washington area.

Read it at the Federal Register →

What the Rule Says It Does

The Environmental Protection Agency (EPA) is finalizing multiple actions related to the Washington, DC-MD-VA nonattainment area (the Washington Area or the Area) for the 2015 8-hour ozone national ambient air quality standards (2015 ozone NAAQS). First, the EPA is determining that the Washington Area attained the 2015 ozone NAAQS by the applicable attainment date of August 3, 2024. Second, the EPA is determining that the Washington Area has clean data under the EPA's Clean Data Policy. Lastly, the EPA is taking final action on an exceptional events request submitted by the District of Columbia (DC) on March 20, 2024, and concurred on by the EPA on July 17, 2024. This action addresses the EPA's obligation under Clean Air Act (CAA) sections 179(c) and 181(b)(2) to determine whether the Washington Area attained the 2015 ozone NAAQS by the August 3, 2024 attainment date and, as set forth in the EPA's Clean Data Policy, will suspend the obligation of DC, the State of Maryland (MD), and the Commonwealth of Virginia (VA) to submit certain attainment planning requirements for as long as the Washington Area continues to attain the 2015 ozone NAAQS. This action is being taken under the CAA.

This is the rule's own summary, as the Federal Register prints it.

The Orders It Names

The rule names these orders itself. What it does about them is a reading, and none is recorded here.

How to cite this
  1. The rule itself

    Environmental Protection Agency, “Air Plan Approval; District of Columbia, Maryland, Virginia; Determination of Attainment by the Attainment Date and Clean Data Determination for the Washington, DC-MD-VA Nonattainment Area for the 2015 Ozone National Ambient Air Quality Standards,” 90 FR 14730 (April 4, 2025). Effective May 5, 2025.
    https://www.federalregister.gov/documents/2025/04/04/2025-05913/air-plan-approval-district-of-columbia-maryland-virginia-determination-of-attainment-by-the

  2. This page

    “Air Plan Approval; District of Columbia, Maryland, Virginia; Determination of Attainment by the Attainment Date and Clean Data Determination for the Washington, DC-MD-VA Nonattainment Area for the 2015 Ozone National Ambient Air Quality Standards,” a final rule naming an order indexed here. Read the Mandate, https://readthemandate.org/rules/rule-2025-05913/ (retrieved August 26, 2026).

Cite the document when the claim is about what the document says. Cite this page when the indexing, the wording or the record of what has happened is what is being relied on.

How This Rule Is Quoted

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