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Chapters 173-400, -423, -476 WAC

General Regulations for Air Pollution Sources – Chapter 173-400 WAC
Low Emission Vehicles – Chapter 173-423 WAC
Ambient Air Quality Standards – Chapter 173-476 WAC

Public Involvement



Elena Guilfoil
(360) 407-6855


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Washington Clean Air Act

Appeal Procedures

This adoption can be appealed under procedures described in the Administrative Procedure Act (Chapter 34.05 RCW), including those found in RCW 34.05.330

Public Hearing

Ecology held two consecutive hearings to accept comments.

Date: April 5, 2016
Location: Ecology, 300 Desmond Drive, Lacey, WA 98503
Time: 2 p.m.

  • Hearing 1 - comments on the proposed rule amendments
  • Hearing 2 (immediately following) - comments on submitting portions of the proposed rules into the State Implementation Plan (SIP)

Comments Received

Ecology accepted comments between February 25 and April 12, 2016. Ecology received no comments at the hearing, by mail, email, or in another written format.

More information

General answers about Ecology's rulemaking process are listed in the Laws & Rules Frequently Asked Questions page.

Accessibility (ADA)

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

Ecology's ADA Accessibility page.