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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Washington Mandatory Greenhouse Gas Reporting Program - Reported Emissions for 2012-2015

Certain large facilities are required to submit their greenhouse gas emissions to Ecology. This is the report of those emissions from 2012-2015.

https://ecology.wa.gov/wa-ghg-reporting-data-2012-2015

Transportation Fuel Supplier Greenhouse Gas Emission Calculator

This tool helps transportation fuel suppliers calculate their greenhouse gas emissions.

https://ecology.wa.gov/transportationfuelsuppliertool

Washington Total Annual Emissions

bar chart shoring Washington greenhouse gases the past decade

https://ecology.wa.gov/2011-2018_ghg-barchart-alt

Washington State Agencies Required to Report their Greenhouse Gas Emissions to Ecology

Some Washington state agencies are required to report their greenhouse gas emissions to Ecology. This is a list of those that are required.

https://ecology.wa.gov/stateagenciesrequiredtoreportghg

Washington State Agency Greenhouse Gas Reporting and Calculator Instructions

Instructions to help state agencies fill out the greenhouse gas calculator.

https://ecology.wa.gov/stateagencyghgcalculatorinstructions

Air Quality Application Portal Training Guide

Instructions about how to access the Air Quality Portal within Secure Access Washington. You must access this portal for reporting. Version 1.1

https://ecology.wa.gov/aqportaluserguide

Clean Air Rule Tracking System User Training Guide

Instructions for entering information into the Clean Air Rule Tracking system

https://ecology.wa.gov/cartsuserguide

Approved verifiers and verification bodies for greenhouse gas reporting

A list of approved third party verifiers and verification bodies in Washington's Greenhouse Gas Reporting Program.

https://ecology.wa.gov/2017ghgverifierlist

Clean Air Rule: Potentially Eligible Parties

Organizations that emit 70,000 metric tons of carbon pollution or more are regulated by the Clean Air Rule. This is a list of organizations that potentially meet this criteria.

https://ecology.wa.gov/potentialbussinessescoveredbycar

ZEV Credit Options (WAC 173-423) 04/2022

This is an April 2022 evaluation of credit options for the zero emission vehicles (ZEV) market in Washington.

https://ecology.wa.gov/zev-credit-options-wac-173-423-04-2022

ZEV Credit Options (WAC 173-423) 02/2022

This is an evaluation of credit options for the zero emission vehicles (ZEV) market in Washington.

https://ecology.wa.gov/zev-credit-options-wac-173-423-02-2022

Notice to Withdraw Rulemaking (WAC 173-400) 04/01/19

This is the notice to withdraw rulemaking for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/withdrawal-notice-wac-173-400-04-01-19

WSPA proposal (WAC 173-400) 01/01/19

This is Western States Petroleum Association's (WSPA) 1/19 proposed rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/wspa-proposal-wac-173-400-01-01-19

Withdrawal letter (WSR 16-06-072) 02/26/16

This the withdrawal notice for the original CR-102 filed on January 5, 2016.

https://ecology.wa.gov/withdrawal-letter-wsr-16-06-072-02-26-16

Notice to Withdraw Rulemaking and Immediately Refile (WAC 173-455; 173-400) 04/18/18

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

https://ecology.wa.gov/withdrawrefile-wac173-455;wac173-400-041818

WA-GREET supplemental (WAC 173-424) 11-28-22

This is the final supporting documentation for WA-GREET, Washington's version of the Greenhouse Gases, Regulated Emissions, and Energy Use in Technologies Model.

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

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

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

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

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

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

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

Air Quality Index (AQI)

The Air Quality Index (AQI) tells you when air quality is healthy or unhealthy.

https://ecology.wa.gov/research-data/monitoring-assessment/air-quality-index