Regulations & Permits

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

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Revised Diesel Engine Exhaust Particulate Matter Health Risk Assessment Report Quincy, Washington

This report is a final health risk assessment (HRA) of diesel particles from some Quincy data centers.

https://ecology.wa.gov/20180806healthdieseldatacenter

TransAlta Best Available Retrofit Technology (BART) order, second revision, 7/29/20

This is the second revised TransAlta Best Available Retrofit Technology (BART) order, 7/29/20.

https://ecology.wa.gov/20200729transaltabartorderrevised

Air Quality data for Intalco Storymap

A table showing the number of days in each Air Quality Index category near Intalco

https://ecology.wa.gov/20200414-intalcostorymap

Regional Haze SIP revision 10-2021

Regional Haze SIP revision October 2021

https://ecology.wa.gov/20211018-regional-haze-sip-revision

2022FinalRegistrationBudget

Final 2022-2023 Budget for Air Quality Registration

https://ecology.wa.gov/2022finalregistrationbudget

VW grant notice for garbage trucks, etc. May 2023 (updated August 2023)

This is the August 2023 grant notice for zero-emission refuse vehicles, street sweepers, freight switcher locomotives, and port cargo handling equipment.

https://ecology.wa.gov/asset-collections-doc-assets-air-quality-vw-202305vwgrant

2017 and 2018 air quality days

A color coded chart showing the air quality days from good to very unhealthy for 2017 and 2018.

https://ecology.wa.gov/2019aqigraphic1718-alt

The Tri-Cities Ozone Precursor Study

A report on the ozone study conducted in the Tri-Cities area.

https://ecology.wa.gov/20171212tricitiesozoneprecursorstudy

Air Operating Permit Report for Fiscal Years 2022 and 2023, updated November 2021

This is the workload analysis and budget report for the Air Operating Permit Program for Fiscal Years 2022 and 2023, updated November 2021.

https://ecology.wa.gov/202111aopreportfy22

VW federal Electric School Bus Grant Awards

A breakdown of VW federal grant awards for electric school buses by county and school district.

https://ecology.wa.gov/asset-collections-doc-assets-air-quality-vw-20200427-vwfed-elecschoolbusawards-alt

Technical Support Document for Best Available Retrofit Technology (BART) order second revision, TransAlta, 7/20

This is the technical support document for the second revision of the Best Available Retrofit Technology (BART) order for TransAlta, 7/20.

https://ecology.wa.gov/202007transaltabart2tsd

2020 SO2 attainment recommendation for Chelan and Douglas counties

Ecology's recommendation to EPA that the agency find Chelan and Douglas counties to be in attainment for sulfur dioxide air pollution.

https://ecology.wa.gov/20200716-ecologyso2attainmentrecommendationdouglas

Monitoring Ozone Air Pollution in Quincy

Information about Monitoring for Ozone Air Pollution in Quincy, 1/30/12

https://ecology.wa.gov/quincyozone

Yakima Air Wintertime Nitrate Study

A study about high nitrate levels in Yakima's winter air.

https://ecology.wa.gov/yakimaairwinterstudyreport

TransAlta Memorandum of Agreement (MOA), 12/23/11

This is the Memorandum of Agreement (MOA) for TransAlta, 12/23/11.

https://ecology.wa.gov/transaltasignedmou

State Implementation Plan Process

This is the text version of the steps to develop and finalize a state implementation plan.

https://ecology.wa.gov/171026stateimplementationplanprocess-alt-docx

VW state settlement allocations

A pie chart showing how the VW state settlement funds are being used.

https://ecology.wa.gov/20200408-vwallocationscircle-alt

Table of ASIL, SQER, and de minimis emission values – WAC 173-460-150 (Effective 12-23-2019)

This is the 12/23/19 sortable table of toxic air pollutants (TAPs) listed in Chapter 173-460 WAC, Controls for New Sources of Toxic Air Pollutants.

https://ecology.wa.gov/table-of-asil-sqer-and-de-minimis-emission-value

How can I protect my health at different AQI values

A color coded chart with numerical values telling what actions to take to protect your health during an air quality event.

https://ecology.wa.gov/2019aqigraphic-alt

NOx reductions alt text document

Arrow showing past & current NOx reductions in comparison to our goal and future reductions using VW settlement funds

https://ecology.wa.gov/20200407-noxreductionsarrow-alt