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ARTICLE · 20 MAY 2026

Indirect Sources Rules In Colorado: Denver Regional Authority Moves Forward To Regulate Four Key Sectors

Beveridge & Diamond, P.C.
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Denver’s Regional Air Quality Council (RAQC) is developing Indirect Source Rules (ISRs) to curb emissions from trucks and passenger vehicles by regulating facilities such as warehouses, entertainment venues...

United StatesEnvironment
Timothy Pohle
Timothy Pohle
Jessalee L. Landfried
Jessalee L. Landfried
R. Justin Smith
R. Justin Smith
Thomas "Tap" P. Kolkin
Thomas "Tap" P. Kolkin
Amandine M. Fromont
Amandine M. Fromont

Key Takeaways

  • Denver’s Regional Air Quality Council (RAQC) is developing Indirect Source Rules (ISRs) to curb emissions from trucks and passenger vehicles by regulating facilities such as warehouses, entertainment venues, universities, and airports.
  • Initial comments are due June 1, 2026, with further stakeholder workshops in July and August.
  • RAQC plans to present more detailed recommendations for updates to its Control Strategy Blueprint in Fall 2026 and to present a proposal to the Colorado Air Quality Control Commission in November 2026.
  • Other jurisdictions are also moving forward with similar rules; California’s South Coast Air Quality Management District, New York, and Illinois have recently taken key steps.

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