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Research & Data

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

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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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Research & Data

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

Research & Data icon

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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2019 Transportation Fuel Supplier Calculator
2019 Calculator to determine greenhouse gas emissions from transportation fuel suppliers
https://ecology.wa.gov/2019-transportation-fuel-supplier-tool
2022 Greenhouse Gas Reporting Instructions
Instructions for state agencies on how to report their greenhouse gas emissions
https://ecology.wa.gov/20220110-ghg-reporting-instructions
2021 State Agency Greenhouse Gas Reporting Calculator
Calculator for state agencies to determine their greenhouse gas emissions
https://ecology.wa.gov/2021-state-agency-ghg-calculator
2023StateAgencyGHGCalculator
Calculator for state agencies to determine their GHG emissions
https://ecology.wa.gov/2023-state-agency-ghg-calculator
2020 State Agency Greenhouse Gas Calculator
Calculator for state agencies to determine their greenhouse gas emissions
https://ecology.wa.gov/2020-state-agency-greenhouse-gas-calculator
Washington's greenhouse gas emissions targets
A chart showing greenhouse gas emission reduction targets compared to a 1990 baseline.
https://ecology.wa.gov/20190729emissions-alt
Pacific Northwest Volkswagen (VW) Zero-Emissions Vehicle (ZEV) Investment Proposal
Investment proposal for Pacific Northwest Volkswagen (VW) Zero-Emissions Vehicle (ZEV)
https://ecology.wa.gov/20161223pnwzevinvestmentproposal
Adopted rule language (WAC 173-407) 02/21/18
This is adopted rule language for WAC 173-407 Greenhouse Gas Mitigation Requirements and Emissions Performance Standard for Power Plants.
https://ecology.wa.gov/adopted-rule-language-wac-173-407-02-21-18
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
Presentation (WAC 173-441) 07/22/21
This is a presentation for the 7/22/21 stakeholder meeting for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/presentation-wac-173-441-07-22-21
Rulemaking Adoption Notice (WAC 173-441) 02/09/22
This is a rulemaking adoption notice (CR-103) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-441-02-09-22
Rulemaking Announcement (WAC 173-441) 07/07/21
This is a rulemaking announcement (CR-101) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-announcement-wac-173-441-07-07-21
Rulemaking Adoption Notice (WAC 173-442; WAC 173-441) 09/15/16
This is a rulemaking adoption (CR-103) for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-adoption-notice-wac-173-442;-wac-173-4
Rulemaking Announcement (WAC 173-442; WAC 173-441) 09/21/15
This is a rulemaking announcement for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-announcement-wac-173-442;-wac-173-441
Rulemaking Proposal (WAC 173-441) 10/06/21
This is a rulemaking proposal (CR-102) for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-proposal-wac-173-441-10-06-21
Rulemaking proposed language (WAC 173-441) 10/06/21
This is the proposed rule language for Chapter 173-441 WAC, Reporting of Emissions of Greenhouse Gases.
https://ecology.wa.gov/rulemaking-proposed-language-wac-173-441-10-06-21
Rulemaking proposal (WAC 173-442; WAC 173-441) 05/31/16
This is a rulemaking proposal (CR-102) for WAC 173-442 Clean Air Rule; WAC 173-441 Reporting of Emissions of Greenhouse Gases
https://ecology.wa.gov/rulemaking-announcement-wac-173-442;-wac-173-1
Rulemaking proposal language for (WAC 173-441) 05/18/16
This is proposed rule language for WAC 173-441, Reporting of Emissions of Greenhouse Gases
https://ecology.wa.gov/rulemaking-proposal-language-for-wac-173-442;-wac
State Agency Reporting Instructions
.pdf instructions for State Agencies reporting GHG emissions using the State Agency GHG Reporting tool
https://ecology.wa.gov/2024stateagencyreportinginstruction-ghgreporting
Washington Emissions Inventory Reporting System (WEIRS) training, 1/30/25
This is the presentation for the January 30, 2025 training about Washington Emissions Inventory Reporting System (WEIRS).
https://ecology.wa.gov/20250130weirstraining
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