Engine Rulemaking Process

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The Air Pollution Control Division is holding a series of stakeholder meetings to educate interested parties, keep the process as transparent as possible, and work together to inform the rulemaking process regarding the Control of Nitrogen Oxides (NOx) Emissions from All Engines Greater than or Equal to 1,000 horsepower (hp) in Colorado. The Division will update this webpage as additional opportunities for public input are scheduled.

The Division has introduced a concept in addressing emissions reduction via proposed changes to Regulation 7 for Natural Gas-fired Reciprocating Internal Combustion Engines. A one-page summary of the initial proposal for this rule can be found below, which is meant to start the conversation and is not indicative of any final decision.


Colorado Air Quality Control Commision (AQCC) Timeline

  • June 18, 2020: AQCC request for rulemaking hearing
    • Once set for a formal rulemaking hearing, all comments on the engine rulemaking must be sent to cdphe.aqcc-comments@state.co.us in order to be included in the official rulemaking record. 
  • September 17, 2020: AQCC rulemaking hearing

Ongoing opportunities for stakeholders to submit written questions or comments regarding the proposed revisions to cdphe.commentsapcd@state.co.us with "Engine Rule" in the subject line. 

Division Contact:
Lisa Devore
303 692 3117

Stakeholder Engagement Information