Chapters 173-400 and 173-401 WAC, General Regulations for Air Pollution Sources

We propose to update two rules:

This rulemaking may also:

  • Clarify language.
  • Improve regulatory requirements for air quality.

Rulemaking timeline

Announcement phase (CR-101)

Filing date:
Jan. 18, 2024

Announcement documents

Rule development phase

Jan. 18, 2024 – Fall 2024

Public input & involvement

We plan to hold stakeholder meetings in Spring 2024. We will update this page with meeting specifics. To get updates about these meetings and this rulemaking, join our email list.

Additional languages


To request ADA accommodation for disabilities, or printed materials in a format for the visually impaired, contact Ecology's ADA Coordinator by email at, or call 360-407-6831. People with impaired hearing may call Washington Relay Service at 711. People with speech disability may call TTY at 877-833-6341.