Air quality, energy & greenhouse gas emissions

All WSDOT projects must comply with the Clean Air Act and Amendments of 1990, the Washington State Clean Air Act, local requirements, and follow agency guidance. Use the webpages linked below to determine what type of analysis and documentation your project requires and for instruction on completing required analyses and documentation.

Determine what type of analyses your project will require

WSDOT addresses air quality, energy, and greenhouse gas emissions from projects together because they often use the same tools, however each analysis has slightly different triggers.

Refer to the Analysis decision tree (PDF 564KB) to determine which types of analyses your project requires. If your WSDOT project needs an analysis, inform the Environmental Documentation and Permit Specialist assigned to your project.

  • Air quality conformity - see list of exempt project types in WAC 173-420-110
  • Mobile source air toxics (MSAT) emissions
  • Greenhouse gas (GHG) emissions
  • Energy

Slow down on ice and snow.

It's easier to skid or lose control traveling at higher speeds. Give yourself more time to stop.

Carry chains, practice installing them.

Winter conditions could mean chains are required on your route. Practice putting them on your vehicle ahead of time.

Pack your winter car kit.

Carry extra supplies like warm clothing, ice scraper and brush, jumper cables and other emergency items.