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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Rulemaking withdrawal Notice (WAC 173-491) 8/19/2021

This is a rulemaking withdrawal notice for WAC 173-491 WAC Emissions standards and controls for sources emitting gasoline vapors

https://ecology.wa.gov/rulemaking-withdrawal-wac-173-491-08-19-2021

Rulemaking proposed language (WAC 173-446A) 12/22/21

This is the proposed rule language for Chapter 173-446A WAC, Criteria for Emissions-Intensive, Trade-Exposed Industries.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-446a-12-22-21

Secondary economic impacts analysis (REMI) (WAC 173-442; WAC 173-441) 09/15/16

This is the secondary economic impacts analysis (REMI) for WAC 173-442 and WAC 173-441.

https://ecology.wa.gov/secondary-economic-impacts-analysis-remi-wac-17

SEPA checklist, including a staff report - non-project review form (WAC 173-442; WAC 173-441) 01/05/

This is the SEPA checklist for WAC 173-442 Clean Air Rule and WAC 173-441Reporting of Emissions of Greenhouse Gases rulemaking.

https://ecology.wa.gov/sepa-checklist-including-a-staff-report-non-p-1

SEPA checklist, including a staff report - non-project review form

This is the SEPA checklist for WAC 173-442 Clean Air Rule and WAC 173-441Reporting of Emissions of Greenhouse Gases rulemaking.

https://ecology.wa.gov/sepa-checklist-including-a-staff-report-non-pro

SEPA determination of non-significance (WAC 173-442; WAC 173-441) 01/05/16

This is the SEPA determination of non-significance for WAC 173-442 and WAC 173-441

https://ecology.wa.gov/sepa-determination-of-non-significance-wac-173-44

SEPA determination of non-significance 05/31/16

This is the SEPA determination of non-significance for WAC 173-442 Clean Air Rule and WAC 173-441. Reporting of Emissions of Greenhouse Gases rulemaking.

https://ecology.wa.gov/sepa-determination-of-non-significance-05-31-16

SEPA determination of non-significance and addendum (WAC 173-442; WAC 173-441) 09/15/16

This is the SEPA determination of non-significance and addendum for WAC 173-442 and WAC 173-441

https://ecology.wa.gov/sepa-determination-of-non-significance-and-addendu

Unofficial rule language - readable format (WAC 173-442) 05/31/16

This is Unofficial rule language - readable format for WAC 173-442.

https://ecology.wa.gov/unofficial-rule-language-readable-format-wac-17

Table of Contents (WAC 173-446) 5-16-22

This is the table of contents for proposed rule language for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/table-of-contents-wac-173-446-5-16-22

Comments from the July 12, 2016, public hearing (written) (WAC 173-442; WAC 173-441) 7/12/16

Written comments from the July 12, 2016, public hearing.

https://ecology.wa.gov/written-comments-from-the-july-12-2016-public-hea

Written comments from the July 14, 2016, public hearing in Olympia (WAC 173-442; WAC 173-441)

Written comments from the July 14, 2016, public hearing.

https://ecology.wa.gov/written-comments-from-the-july-14-2016-public-hea

Rulemaking proposed language (WAC 173-443) 7-13-23

This is proposed rule language for Chapter 173-443 WAC, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-443-7-13-23

Rulemaking proposed language (WAC 173-455) 7-13-23

This is proposed rule language for Chapter 173-455 WAC, Air Quality Fee Rule.

https://ecology.wa.gov/rulemaking-proposed-language-wac-173-455-7-13-23

Air quality studies

Information about air quality studies we conduct.

https://ecology.wa.gov/research-data/scientific-reports/air-quality-studies

Publication index: Climate change publications and reports

List of links to all Ecology climate change publications, sorted by year.

https://ecology.wa.gov/climate-publications

Hydrofluorocarbon rulemaking email notification list

Join our Hydrofluorocarbon (HFC) rulemaking email list

https://ecology.wa.gov/hydrofluorocarbon-rulemaking-email-notification-list

Email list: Zero emissions vehicles

https://ecology.wa.gov/email-list-zero-emissions-vehicles

Publication: Hydrofluorocarbons Adopted Rule Language – Informational Guidebook

This guidebook is supplemental and is intended to provide general information to stakeholders about the Chapter 173-443 WAC Hydrofluorocarbons (HFCs) and Other Fluorinated Greenhouse Gases rule language and how it may affect them.

https://ecology.wa.gov/publication-hydrofluorocarbons-adopted-rule-language-informational-guidebook

Washington Climate Action

Our Climate Committment Act is creating jobs, lowering costs, fighting climate change. Learn about incentive & rebate programs; training for green jobs; and climate work happening in Washington.

https://ecology.wa.gov/washington-climate-action