Research & Data

Use this portal to filter and search for all of our scientific information.

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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Prior years point source emissions data

This spreadsheet shows emissions from facilities and other point sources from 2009 forward.

https://ecology.wa.gov/prior-years-point-source-emissions

Rulemaking Adoption Notice (WAC 173-423) 12/27/18

This is a rulemaking adoption notice (CR-103) for WAC 173-423, Low Emission Vehicles.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423-12-27-18

Rulemaking Adoption Notice (WAC 173-423; WAC 173-400) 11/29/21

This is a rulemaking adoption notice (CR-103) for Chapter 173-423 WAC, Clean Vehicles Program; Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-423;-wac-173-40

Rulemaking Adoption Notice (WAC 173-422; WAC 173-422A) 06/02/21

This is a rulemaking adoption notice for Chapters 173-422 and 173-422A WAC, Motor Vehicle Emission Inspection.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-422;-wac-173-4

Presentation (WAC 173-455) 10-13-22

This is a presentation for the 10/13/22 public hearing for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/presentation-wac-173-455-10-13-22

Rulemaking Adoption Notice (WAC 173-407) 02/21/18

This is a rulemaking adoption (CR-103) for WAC 173-407 Greenhouse Gas Mitigation Requirements and Emissions Performance Standard for Power Plants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-407-02-21-18

Presentation (WAC 173-455) 06-08-22

This is a presentation for the 6/8/22 stakeholder meeting for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/presentation-wac-173-455-06-08-22

Presentation (WAC 173-455) 05-18-22

This is a presentation for the 5/18/22 stakeholder meeting for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/presentation-wac-173-455-05-18-22

Rulemaking Adoption Notice (WAC 173-405; WAC 173-410; WAC 173-415) 04/23/19

This is a rulemaking adoption notice (CR-103) for Chapter 173-405 WAC, Kraft Pulping Mills; Chapter 173-410 WAC, Sulfite Pulping Mills; Chapter 173-415 WAC, Primary Aluminum Plants.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-405;-wac-173-4

Public hearing presentation (March 13, 2018)

This is the presentation for the proposed changes to Chapters 173-400 and 173-401 WAC.

https://ecology.wa.gov/public-hearing-presentation-wac-173-400;401-03-1

Rulemaking Adoption Notice (WAC 173-400; WAC 173-401) 08/16/18

This is a rulemaking adoption notice (CR-103) for Chapter 173-400 WAC, General Regulations for Air Pollution; Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-400;-wac-173-4

Presentation slides (WAC 173-455; WAC 173-400) 03/21/17

This is a powerpoint presentation for a meeting on 3/21/17 for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/presentation-slides-wac-173-455;-wac-173-400-03

Presentation (WAC 173-460) 08/20/18

This is a presentation for the 8/20/18 stakeholder meeting for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/presentation-wac-173-460-08-20-18

Presentation about criteria air pollutants as toxic air pollutants (WAC 173-460) 11/16/18

This is a presentation for the 11/16/18 stakeholder meeting about criteria air pollutants as toxic air pollutants. It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/presentation-about-criteria-air-pollutants-as-toxi

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

This is a presentation 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/presentation-about-dimethyl-mercury-inhalation-ris

Presentation about small quantity emission rates-de minimis emission values (WAC 173-460) 01/23/19

This is a presentation for the 1/23/19 stakeholder meeting about small quantity emission rates (SQER) and de miminis emission values. It is related to rulemaking for Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/presentation-about-small-quantity-emission-rates-d

Rulemaking Adoption Notice (WAC 173-408) 5-13-24

This is a rulemaking adoption notice (CR-103) for Chapter 173-408 WAC, Landfill Methane Emissions.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-408-5-13-24

Proposed Source Test Manual (WAC 173-400; WAC 173-401) 9-18-24

This is the proposed Source Test Manual, September 18, 2024.

https://ecology.wa.gov/proposed-source-test-manual-wac-173-400;-wac-173-401-9-18-24

Presentation (WAC 173-448) 12-12-24

This is a presentation for the December 12, 2024 stakeholder meeting for Chapter 173-448 WAC, Air Quality in Overburdened Communities.

https://ecology.wa.gov/presentation-wac-173-448-12-12-24

Rulemaking Adoption Notice (WAC 173-400; WAC 173-401) 2-12-25

This is a rulemaking adoption notice (CR-103) for Chapter 173-400 WAC, General Regulations for Air Pollution Sources and Chapter 173-401 WAC, Operating Permit Regulation.

https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-400;-wac-173-401-2-12-25