NOTICE: Ecology will suspend certain services starting July 1 in the unlikely event the Legislature does not enact state budgets before July 1. More information about suspended services.

Program Template photo identifier

Rule Making

Chapter 173-442 WAC, Clean Air Rule
Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases

Public Involvement

On September 15, 2016, Ecology adopted Chapter 173-442 WAC, Clean Air Rule (CAR) and amended Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases. Over the past year, Ecology held numerous educational events around the state, including several online forums and four public hearings. During the public comment period, Ecology received over 3,000 comments. Ecology prepared a Concise Explanatory Statement with responses to the comments.

Comments Received

Public Hearings and Webinars

Ecology hosted a series of public hearings and webinars, with presentations and question-and-answer sessions. Oral comments were accepted during the public hearings.

Public hearings:

Informational webinars:

* Due to technical difficulties, the first 12 minutes of this video is from the same presentation given earlier to a different audience.

About the rule


Accessibility (ADA)

For special accommodations or documents in alternate format, call 360-407-6800, 711 (relay service), or 877-833-6341 (TTY). Ecology's ADA Accessibility page.

Para información en español acerca del cambio climático global o la Regla de Aire Limpio, favor de contactar a Gretchen Newman, (360) 407-6097 o

For questions in languages other than English or Spanish, please contact the rule writer, Sam Wilson, at (360) 407-6837 and we will connect with you through an interpreter.



Sam Wilson
(360) 407-6837


WA Carbon Reduction Clean Energy
Air Quality Rules and State Implementation Plans


Limiting Carbon Pollution
Washington Clean Air Act
Air Quality Rules


Current Rulemaking
Closed Rulemaking