Commenting open: January 12, 2026 12:00AM PT - February 12, 2026 11:59PM PT.
Air Quality Recommendation: Washington is meeting the 2024 Secondary Sulfur Dioxide Ambient Air Quality Standard
Ecology invites you to submit comments on our recommendation to EPA to designate all areas in Washington as "attainment/unclassifiable" for the 2024 national ambient air quality standard for sulfur dioxide (SO2). Based on ambient air quality monitoring data, emissions inventories, and air quality trends:
All areas with SO2 monitoring are meeting the standard (attainment).
In unmonitored areas, available information shows the standard is also being met (unclassifiable).
Recommendation
You can review the document online at: [LINK] or by clicking the button "Read SO2 Report” at the bottom of this webpage.
Printed copy available on request.
Public hearing on request
You may use the comment form, or email Anya Caudill, to request a public hearing. Requests must be received by February 12, 2026. If requested, we will automatically extend the comment period through February 27, 2026 and hold an online public hearing on February 25, 2026, at 6 p.m. Find webinar link at: Areas meeting and not meeting air standards webpage.
If no hearing is requested, we will post a cancellation to that webpage, or you may call Anya Caudill at 360-791-5499 to inquire about the status of the public hearing and public comment period.
Next steps
After the public comment period, we will carefully consider and respond to comments. We will post updates and a Responsiveness Summary on Ecology’s Areas meeting and not meeting air standards webpage and email updates to commenters who provided contact info.
The Director of Ecology, as the Governor's designee, will make the final decision on the recommendation. EPA will consider state's recommendations and notify the states before making their final decision about how to designate each area of the state. EPA will hold a public comment period before designating the areas.
Thank you for subscribing to the Air Quality Recommendation: Washington is meeting the 2024 Secondary Sulfur Dioxide Ambient Air Quality Standard mailing list.
Ecology invites you to submit comments on our recommendation to EPA to designate all areas in Washington as "attainment/unclassifiable" for the 2024 national ambient air quality standard for sulfur dioxide (SO2). Based on ambient air quality monitoring data, emissions inventories, and air quality trends:
Recommendation
Public hearing on request
You may use the comment form, or email Anya Caudill, to request a public hearing. Requests must be received by February 12, 2026. If requested, we will automatically extend the comment period through February 27, 2026 and hold an online public hearing on February 25, 2026, at 6 p.m. Find webinar link at: Areas meeting and not meeting air standards webpage.
If no hearing is requested, we will post a cancellation to that webpage, or you may call Anya Caudill at 360-791-5499 to inquire about the status of the public hearing and public comment period.
Next steps
After the public comment period, we will carefully consider and respond to comments. We will post updates and a Responsiveness Summary on Ecology’s Areas meeting and not meeting air standards webpage and email updates to commenters who provided contact info.
The Director of Ecology, as the Governor's designee, will make the final decision on the recommendation. EPA will consider state's recommendations and notify the states before making their final decision about how to designate each area of the state. EPA will hold a public comment period before designating the areas.
More information
For more information about the sulfur dioxide national ambient air quality standard, please visit Ecology’s Sulfur Dioxide Air Pollution webpage.
Contact Information
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