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Air Permits for Colorado Business and Industry

As of January 1, 2014, the Colorado Air Pollution Control Division no longer accepts blank APENs. Additional fees will apply if an APEN is submitted without the necessary information. An application with missing information may result in longer processing times.  Please note that all APEN submissions should be completed using forms currently supplied by the Division (see Reg. 3, Part A, Section II.A).  If you need assistance, please refer to: www.colorado.gov/cdphe/sspermits.



Any business in Colorado that emits air pollution may be required to report its emissions and apply for a permit to emit. The type of permit needed is determined by the volume and type of emissions.


Obtaining an Air Permit
  • Determine if You Need an APEN or Air Permit
    • Select sources that emit less than certain thresholds may not need an APEN or Air Permit.  Applicable APEN or permit exempt form letters are available for these sources if desired.  This is a pilot project designed to eliminate the need for an engineer to review an application and issue an APEN or permit exempt letter for certain source categories.
  • Construction Permits 
    • New and existing businesses in Colorado that emit air pollutants above certain threshold levels may trigger the need for an air permit called a "Construction Permit". These are issued through the Air Pollution Construction Permit Unit.
  • Construction Permits for Oil and Gas Facilities
    • The Oil and Gas industry construction permitting process has been developed specifically for that industry.
  • Operating Permits
    • All major sources of air emissions in Colorado are required to obtain an Operating Permit. These sources emit pollutants beyond the level required for a construction permit only. New major sources must first obtain a construction permit, and must apply for an operating permit within 12 months of commencing operation. Also called the Title V Operating Permit Program.
  • General Permits
    • Some sources in the oil and gas and land development industries may qualify for the streamlined general permit process if they meet certain operating and emissions criteria.
  • Permit Public Notices
    • This page contains public notices for current permit actions of the Air Pollution Control Division. Facilities are listed alphabetically, followed by the public notice documents in Adobe PDF format.
  • Check Permit Status
    • Check the Status of a Construction Permit
    • View issued Operating Permits
  • Field Services Unit
    • This unit is responsible for compliance and enforcement. Information regarding inspections, emissions monitoring, reporting, open burning, tank trucks, and enforcement action reports are available here.

Air Permit Guidance and Information