Public Comment Form

Commenting open: June 03, 2026 12:01AM PT - June 28, 2026 11:59PM PT.

Second Informal Public Comment Period: Rulemaking to Update Chapters 173-476 & 173-400 WAC

Ecology is seeking public comments on draft rule language for two air quality rules:


Chapter 173-476 WAC, Ambient Air Quality Standards. The amendments will:


  • Update air quality standards for fine particulate matter (PM2.5) and sulfur dioxide (S02).


Chapter 173-400 WAC, General Regulations for Air Pollution Sources. The amendments will:


  • Update "cause or contribute threshold values" (also called "significant impact levels") and associated provisions used to review new sources of air pollution


We are also making minor administrative changes or corrections.



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The informal comments you provide will help inform the proposed rules. We will propose the amended rules and open up a formal public comment period in Fall 2026.


Ecology will consider all informal comments received, but only respond to comments submitted during the formal public comment period.


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