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Klamath Falls PM2.5 Maintenance Plan 2024

Adopted rule

Administrative Order No. DEQ-6-2024
Filed and Effective: May 25, 2024  
See Oregon Bulletin, June 2024
Rulemaking contact: Graham Bates, 503-501-0138

The Environmental Quality Commission approved submitting to the U.S. Environmental Protection agency a request to redesignate the Klamath Falls airshed from nonattainment to attainment with the 24-hour National Ambient Air Quality Standard for small particulate, diameter less than 2.5 microns.

With each PM2.5 redesignation request, the Clean Air Act requires that states submit a revision of the applicable State Implementation Plan to provide for maintenance of the PM2.5 NAAQS for at least 10 years after the redesignation. This is called a PM2.5 Maintenance Plan. The 10-year maintenance period begins on the effective date of EPA's approval of the redesignation request, as published in the Federal Register.

DEQ will submit a revision to the State of Oregon Clean Air Act Implementation Plan, referred to as the State implementation Plan under OAR 340-200-0040. This revision will:

  • Redesignate the Klamath Falls airshed as attainment for the 24-hour PM2.5 NAAQS; and
  • Include a maintenance plan to keep air quality within the PM2.5 health standards for at least 10 years after the redesignation.

Public involvement

The comment period closed at 11:59 p.m. on April 29, 2024.

For more information, see the Notice of Proposed Rulemaking, which includes the notice and proposed rules.

Supporting documents
Public hearing

A public hearing was held April 29, 2024.

EQC action

The Environmental Quality Commission adopted these rules at its meeting on May 23, 2024.

Item B: Klamath Falls PM2.5 Maintenance Plan 

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