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Colorado air permit public notices

Help in your language: Some documents are currently only available in English. To request assistance in Spanish or another language, email cdphe_apcd_outreach@state.co.us. Please include the topic and “language assistance” in the subject line. Please also link to the specific document or information you’d like to access.

Ayuda en el idioma de su preferencia: algunos documentos solo están disponibles en inglés por el momento. Si desea solicitar asistencia en español o en otro idioma, envíe un correo electrónico a cdphe_apcd_outreach@state.co.us. Indique el tema y la frase “language assistance” (asistencia en otro idioma) como asunto de su mensaje. Incluya también un enlace a la información o documento que desea consultar.

For questions or assistance related to the Environmental Justice Report Tool for Air Quality Regulation 3, please email cdphe_apcd_ejreports@state.co.us with “EJ Summary” and the facility name in the subject line.

Overview of air permits in Colorado

For an overview of air permits in Colorado, explore the Air Permitting 101 video (also available in Spanish) and slide presentation (slides also available in Spanish).  These materials cover:

  • What an air permit is.
  • Types of air permits.
  • How to stay informed about air permits. 
  • How to provide feedback on air permits.
  • More ways to engage with the Air Pollution Control Division.

Types of air permits subject to public notice

Construction permits require public notice for reasons listed in Colorado Air Quality Regulation Number 3, Part B, Section III.C. The most common reasons are:

  • New emission limits and/or limit increases in the draft permit trigger the requirement for public comment.
    • These thresholds are:
      • 25 tons per year in a nonattainment area.
      • 50 tons per year in an attainment area.
  • The air pollution source could possibly emit odor above the limits found in the Colorado Air Quality Regulation Number 2.
  • The air pollution source emits hazardous air pollutants at a level that requires them to follow the National Emissions Standards for Hazardous Air Pollutants (NESHAPS).
  • The air pollution source is requesting a federally enforceable limit on potential air pollution emissions to keep yearly emissions low enough to not trigger other regulatory requirements.
  • The CDPHE air division decides that public comment is warranted.
    • This decision may be based on:
      • The length of time for the proposed project.
      • The air pollution source’s location.
      • The type and projected amount of air pollution emissions.
      • Likelihood of public concern.
      • Other relevant factors.

If all air pollution emission standards and ambient air quality standards are met, the division grants an Initial Approval permit. The Initial Approval permit allows the source to construct and start operation. The air pollution source must start construction within 18 months from the date of issuance, or the permit can automatically expire.

Draft Title V operating permits are published on this web page. Public comments are requested for the following permit types:

  • Significant modifications.
  • Initial permits.
  • Renewal permits and re-openings.

All preconstruction permits that include Prevention of Significant Deterioration (PSD) and/or Nonattainment New Source Review Requirements (NANSR) are published on this web page and are open for public comment. 

Current public notice periods

Facility name and county information in air permit public notices come directly from the information in the air permit application. If a facility was required to submit an Environmental Justice Summary, then the air division may also note: 

  1. The facility’s address or geographic coordinates.
  2. Whether the facility is located in a disproportionately impacted community, based on the summary information.

Public Notice Period: December 2 - January 1

Public Notice Period: November 19 - December 19

Public Notice Period: November 18 - December 18

Public Notice Period: November 17 - December 17

Public Notice Period: November 12 - December 12

Public Notice Period: November 10 - December 10

Public Notice Period: November 5 - December 5

Public Notice Period: November 4 - December 4

Air permit public notices

During a public notice period, the division publishes on this web page: 

  • The public notice.
  • The draft permit.
  • Any calculations/analysis documents.
  • Request for written comments from the public.
  • Date range for the public notice period. 

Comments submitted to the division will be uploaded to an online document repository and will be accessible to the public. Your comments and the division's responses are not considered confidential and will be publicly accessible. This includes your name, email address, phone number, address, and any other personal information you provide in your comments.

If you would like to submit a public comment, please first review our Public Participation Guidance. If you have any questions or general comments or would like to send us more information, please email cdphe_apcd_airpermitcomments@state.co.us.

Requesting a hearing

Before the end of a designated comment period, anyone can request a hearing with the Air Quality Control Commission to provide comments about:

  • Sufficiency of the preliminary analysis.
  • Whether the air division should approve or deny the permit application or any other appropriate air quality considerations.

To request a hearing with the commission, please email cdphe_apcd_airpermitcomments@state.co.us and include the following:

  • Identify the individual or group requesting the hearing.
  • State the requestor’s address and phone number.
  • State the reason(s) for the request, how the person is affected by the proceedings, and an explanation of why the person's interests are not already adequately represented.

Please note that only certain permits are eligible for a commission hearing request: 

  • Initial Title V permits.
  • Renewal title V permits.
  • Significant Modifications for Title V permits.
  • Major Prevention of Significant Deterioration (PSD)/Nonattainment New Source Review Requirements (NANSR) permits.

The air division reviews all requests received and follow-ups with the requestor about whether the request will be granted and why.

Public Comment Hearings set by the Air Quality Control Commission (AQCC)

A public hearing has been set by the Air Quality Control Commission (AQCC) for these applications:

Date:           Tuesday, December 9, 2025
Time:          4:30 p.m. - 6:30 p.m. The hearing will conclude by 6:30 p.m. or earlier if all who wish to speak have been heard.
Location:     Online only.

Date:           Saturday December 13, 2025
Time:          10:00 a.m. – 12:00 p.m. The hearing will conclude by 12:00 p.m. or earlier if all who wish to speak have been heard.
Location:     Online only.

To attend the hearing online, please reference the notice of public comment hearing for information on how to register.
The application and associated materials, public notice for public comment period, and draft permit and technical review document are available on the Public Notice Google Drive.

The Air Quality Control Commission has posted documents related to this hearing in the Public Hearing Google Drive folder.
The Division will continue to accept public comments until the conclusion of the public comment hearing on Saturday December 13, 2025, or the deadline set by the AQCC at the public comment hearing.

Additional guidance related to public participation at Air Quality Control Commission hearings can be found on the AQCC public participation and hearing guidance web page.

The division's responses to comments on previous permitting actions can be accessed from the electronic records depository. Search Records.