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Rule Making

Chapter 173-400 WAC - General Regulations for Air Pollution Sources
Chapter 173-423 WAC - Low Emission Vehicles
Chapter 173-476 WAC - Ambient Air Quality Standards
(updating EPA requirements and vehicle emission standards)

Public Involvement

On May 31, 2016, Ecology adopted amendments to the three rules.

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



Elena Guilfoil
(360) 407-6855

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Washington Clean Air Act
Air Quality Rules


Current Rulemaking
Closed Rulemaking