OGE · 10-Q · 2026Q1 · Full report
Particulate Matter NAAQS Revisions
OGE ENERGY CORP. · 2026-04-29 · Importance 53 · Surprise 60
In February 2024 the EPA lowered the primary annual PM2.5 NAAQS from 12.0 µg/m3 to 9.0 µg/m3 and retained other PM standards, with initial attainment/nonattainment designations to be made within two years of issuance. States must prepare and submit attainment plans within 18 months of nonattainment designations, and litigation on the rule is pending in the D.C. Circuit. OG&E noted the potential for impacts to regional air quality goals and emission limits for sources, but stated it is unknown what, if any, material impacts to OG&E's operating permit limits would result. OG&E is monitoring developments and potential regulatory actions.
Key facts
- In April 2024 the EPA issued a final rule lowering the primary annual PM2.5 NAAQS from 12.0 µg/m3 to 9.0 µg/m3, with the EPA to determine attainment designations no later than two years after the new standards are issued and states to develop attainment plans no later than 18 months after nonattainment designations.
Impact estimates
| metric | direction | stage | expected | basis |
|---|---|---|---|---|
| operating_income | negative | probable | — | In April 2024 the EPA issued a final rule lowering the primary annual PM2.5 NAAQS from 12.0 µg/m3 to 9.0 µg/m3, with the EPA to determine… |