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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Expedited Rulemaking Proposal (WAC 173-422; WAC 173-422A) 01/26/21

This is an expedited rulemaking proposal (CR-105 form) for Chapters 173-422 and 173-422A, both called Motor Vehicle Emission Inspection.

https://ecology.wa.gov/expedited-rulemaking-proposal-wac-173-422;-wac-17

Draft rule outline (WAC 173-444) 02/06/20

This is a draft rule outline for Chapter 173-444 WAC, Clean Energy Transformation.

https://ecology.wa.gov/draft-rule-outline-wac-173-444-02-06-20

Draft rule language other changes (WAC-173-400) 12/20/18

These are other changes to the draft rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources. (12/20/18)

https://ecology.wa.gov/draft-rule-language-other-changes-wac-173-400-12

Handout for stakeholder mtg (WAC 173-443) 11/13-14/19

This is the handout for the 11/13-14/19 stakeholder meetings for Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/handout-for-stakeholder-mtg-wac-173-443-11-13-14

Economic questions (WAC 173-444) 02/07/20

These are the economic questions to consider during rule development of Chapter 173-444 WAC, Clean Energy Transformation.

https://ecology.wa.gov/economic-questions-wac-173-444-02-07-20

Draft rule language other changes table (WAC-173-400) 12/20/18

This is a table showing other changes to the draft rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources. (12/20/18)

https://ecology.wa.gov/draft-rule-language-other-changes-table-wac-173-4

Draft work practice standard (WAC 173-400) 08/08/18

This is the draft work practice standard for sulfur recovery unit during startup and shutdown (Chapter 173-400 WAC). Western States Petroleum Association proposed this work practice standard.

https://ecology.wa.gov/draft-work-practice-standard-wac-173-400-08-08-1

Establishing small quantity emission rates (WAC 173-460) 01/16/19

This document discusses establishing small quantity emission rates in Chapter 173-460 WAC.

https://ecology.wa.gov/2019-wac406-establishingsmallquantityemissionrates

EPA SSM Policy 06/12/15

EPA's 2015 Startup, Shutdown & Malfunction Policy

https://ecology.wa.gov/epa-ssm-policy-wac-173-400;401-06-12-15

Evaluating if SQER and de minimis values should be the same (WAC 173-460) 01/17/19

This document evaluates if SQER and de minimis values should be the same in Chapter 173-460 WAC.

https://ecology.wa.gov/20190117-sqeranddeminimisvaluesshouldbethesame

Grocery retailers meeting summary (WAC 173-443) 5/10/22

This is the summary for the 5/10/22 Q&A with grocery retailers about Chapter 173-443 WAC, Hydrofluorocarbons.

https://ecology.wa.gov/grocery-retailers-meeting-summary-wac-173-443-5-10

Far West Agribusiness Association comments (WAC 173-460) 01/16/19

These are Far West Agribusiness Association's 1/16/19 comments to remove ammonium sulfate from the toxic air pollutant list, Chapter 173-460 WAC.

https://ecology.wa.gov/2019-farwestagribusinessassociationcomments

Draft workload analysis (WAC 173-455; WAC 173-400) 05/24/17

This is a draft analaysis of Ecology staff workload to manage the registration program for a meeting on 05/24/17 for for WAC 173-455 Air Quality Fee Rule; WAC 173-400 General Regulations for Air Pollution Sources.

https://ecology.wa.gov/meeting-handout-workload-analysis-wac-173-455;-wa

McGregor comments (WAC 173-460) 01/08/19

These are McGregor's 1/8/19 comments to remove ammonium sulfate from the toxic air pollutant list, Chapter 173-460 WAC.

https://ecology.wa.gov/mcgregor-comments-wac-173-460-01-08-19

Meeting summary (WAC 173-455; WAC 173-400) 03/21/17

This is a summary of 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/meeting-summary-wac-173-455;-wac-173-400-03-21-1

Indirect Land Use Conversion (WAC 173-424) 04/04/22

This documents indirect land use conversion for Washington Clean Fuels Standard, April 4, 2022 version.

https://ecology.wa.gov/indirect-land-use-conversion-wac-173-424-04-04-22

Indirect Land Use Conversion (WAC 173-424) 03/10/22

This documents indirect land use conversion for Washington Clean Fuels Standard.

https://ecology.wa.gov/indirect-land-use-conversion-wac-173-424-03-08-22

Draft Washington GREET model (WAC 173-424) 03/09/22

This spreadsheet is the draft Washington GREET model, fuel carbon intensity calculator for Clean Fuels Standards, March 9, 2022.

https://ecology.wa.gov/washington-greet-model-wac-173-424-03-09-22

Draft Source Test Manual (WAC 173-400; WAC 173-401) 4-9-24

This is the April 9, 2024 draft of the air quality Source Test Manual.

https://ecology.wa.gov/draft-source-test-manual-wac-173-400;-wac-173-401-4-9-24

Draft Source Test Manual (WAC 173-400; WAC 173-401) 4-23-24

This is the April 23, 2024 draft of the air quality Source Test Manual.

https://ecology.wa.gov/draft-source-test-manual-wac-173-400;-wac-173-401-4-23-24