Klamath Falls PM2.5 Maintenance Plan 2024

Proposed rule

Rulemaking contact: Graham Bates, 503-501-0138

DEQ is proposing to submit 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 PM_2.5 redesignation request, the Clean Air Act requires that states submit a revision of the applicable State Implementation Plan to provide for maintenance of the PM_2.5 NAAQS for at least 10 years after the redesignation. This is called a PM_2.5 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 proposes to 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 proposed revision would:

• Redesignate the Klamath Falls airshed as attainment for the 24-hour PM_2.5 NAAQS; and
• Include a maintenance plan to keep air quality within the PM_2.5 health standards for at least 10 years after the redesignation.