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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Adopted rule language (WAC 173-400) 08/16/18

This is adopted rule language for Chapter 173-400 WAC, General Regulations for Air Pollution Sources.

https://ecology.wa.gov/adopted-rule-language-wac-173-400-08-16-18

Adopted emergency rule language (WAC 173-443) 10/20/20

This is emergency adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-443-10-2

Adopted emergency rule language (WAC 173-443) 07/30/19

This is an emergency adopted rule language for WAC 173-443, Hydrofluorocarbons (HFCs).

https://ecology.wa.gov/adopted-emergency-rule-language-wac-173-443-07-3

2024-25 Budget for Air Quality Registration

This is the 2024-2025 budget for air quality registration.

https://ecology.wa.gov/2024-25registrationbudget

CyrusOne Data Center notice of construction (NOC) permit and technical support document

This is the August 2024 air quality notice of construction permit (approval order) and technical support document for CyrusOne Data Center.

https://ecology.wa.gov/202420812cyrusonenocpermit

H5 Data Center notice of construction (NOC) permit

This is the November 2024 air quality notice of construction permit (approval order) for H5 Data Center in Quincy.

https://ecology.wa.gov/20241126h5nocpermit

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