Research & Data

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Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.

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Presentation (WAC 173-423) 04/19/22

This is the presentation for the April 19, 2022 stakeholder meeting about Chapter 173-423 WAC, Clean Vehicles Program and Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/presentation-wac-173-423-04-19-22

Presentation (WAC 173-423) 02/28/22

This is the presentation for the February 28, 2022 stakeholder meeting about Chapter 173-423 WAC, Clean Vehicles Program and Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/presentation-wac-173-423-02-28-22

Notice to Withdraw Rulemaking and Immediately Refile 12/16/16

This is the notice to withdraw the earlier announcement to expand the scope of the rulemaking.

https://ecology.wa.gov/notice-to-withdraw-rulemaking-and-immediately-refi

Memo about early life adjustment factors (WAC 173-460) 02/14/19

This is a 2/14/19 memo about early life adjustment factors in deriving acceptable source impact levels (ASIL) for a subset of toxic air pollutants (TAPs). It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/memo-about-early-life-adjustment-factors-wac-173

Memo about Ecology's recommendations for updating TAP list (WAC 173-460) 03/04/19

This is a 3/4/19 memo about updating the list of toxic air pollutants (TAP). It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/memo-about-ecology-s-recommendations-wac-173-1

Other rule changes (12/06/16)

Possible rule changes not related to SSM

https://ecology.wa.gov/other-rule-changes-wac-173-400;401-12-6-16

Memo about Ecology's recommendations for updating TAP list (WAC 173-460) 02/14/19

This is a 2/14/19 memo about updating the list of toxic air pollutants (TAP). It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/memo-about-ecology-s-recommendations-wac-173-460

Memo about removing ammonium sulfate from toxic air pollutants list (WAC 173-460) 02/14/19

This is a 2/14/19 memo about removing ammonium sulfate from the list of toxic air pollutants (TAP). It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/memo-about-removing-ammonium-sulfate-from-toxic-ai

Meeting summary (WAC 173-455; WAC 173-400) 05/24/17

This is a summary of a meeting on 05/24/17 for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/meeting-summary-wac-173-455;-wac-173-400-05-24-1

Meeting summary (WAC 173-455; WAC 173-400) 04/26/17

This is a summary for a meeting on 4/26/17 for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/workgroup-meeting-summary-wac-173-455;-wac-173-40

Methods for Updating the List of Toxic Air Pollutants, Chapter 173-460 WAC

This documents the methods Ecology is using to update the list of toxic air pollutants in Chapter 173-460 WAC.

https://ecology.wa.gov/2018-guidance-for-updating-the-list-of-toxic-air-p

NCASI comments (WAC 173-460) 03/20/19

These are National Council for Air and Stream Improvement's (NCASI) 3/20/19 comments on acceptable source impact levels (ASIL) in Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/ncasi-comments-wac-173-460-03-20-19

ORCAA comments (WAC 173-460) 02/08/19

These are ORCAA's 2/8/19 comments about de minimis values in Chapter 173-460 WAC.

https://ecology.wa.gov/orcaa-comments-wac-173-460-02-08-19

Poster about dimethyl mercury inhalation risk screening concentration (WAC 173-460) 10/10/18

This is a poster for the 10/10/18 stakeholder meeting about dimethyl mercury inhalation risk screening concentration. It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/poster-about-dimethyl-mercury-inhalation-risk-scre

Presentation (WAC 173-424) 03/15/22

This is a presentation for the 3/15/22 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/presentation-wac-173-424-03-15-22

Presentation (WAC 173-424) 01/27/22

This is a presentation for the 1/27/22 stakeholder meeting for Chapter 173-424 WAC, Clean Fuels Program Rule.

https://ecology.wa.gov/presentation-wac-173-424-01-27-22

Montana GREET model (WAC 173-424) 11-28-22

This spreadsheet is the final Montana GREET model, fuel carbon intensity calculator for Clean Fuels Program, November 28, 2022.

https://ecology.wa.gov/montana-greet-model-wac-173-424-11-28-22

Montana GREET model (WAC 173-424) 07-15-22

This spreadsheet is the Montana GREET model, fuel carbon intensity calculator for Clean Fuels Program, July 15, 2022.

https://ecology.wa.gov/montana-greet-model-wac-173-424-07-15-22

Presentation (WAC 173-400; WAC 173-401) 4-18-24

This is a presentation for the April 18, 2024 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/presentation-wac-173-400;-wac-173-401-4-18-24

Presentation (WAC 173-400; WAC 173-401) 5-15-24

This is a presentation for the May 15, 2024 stakeholder meeting for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/presentation-wac-173-400;-wac-173-401-5-15-24