On this page: Upcoming public participation opportunities | Public Meetings | Meeting accommodation notice | Current projects | Get involved: Air permit public notices | More ways to engage with the state of Colorado | Colorado air quality regulation updates | 10 tips for making effective public comments | Stay informed | Contact us
Upcoming public participation opportunities
Below are ongoing and upcoming public participation opportunities with the Air Pollution Control Division. These events may be in-person, virtual, or hybrid. The division holds regular events such as public meetings, tutorials, and more. The division uses these meetings to share updates, learn from community experiences, and incorporate feedback into our work protecting clean air for all Coloradans.
Questions? Contact cdphe_apcd_outreach@state.co.us. Please include the meeting topic in the subject line.
Public meetings
The air division’s public meetings provide an opportunity to learn more about air quality and climate change topics. These meetings generally allow anyone to ask questions and provide feedback directly to the division. Register for upcoming public meetings below to join and learn more.
Air toxics health-based standards and permitting report
The Air Quality Control Commission chose five priority air toxics in January 2025. Next, the division will propose health-based standards for the five priority air toxics. The division is also developing a report on the scope of a potential air toxics permitting program. After receiving public input, this report will go to the General Assembly.
Join an upcoming public meeting to learn more and share your thoughts on health-based standards and the permitting report.
- Virtual event: Tuesday, April 8, 6 p.m. to 8 p.m.
Hearings on emergency generator use at military installations
The division is hosting online public comment hearings on changes related to emergency generators at military installations. The rule changes are part of House Bill 22-1372: Emergency Engine Exemption Emission Regulation. These public comment hearings will provide an overview of the state law and a discussion on how the law could impact nitrogen oxide emissions from emergency generators at military installations. Nitrogen oxides are air pollutants that contribute to ground-level ozone pollution.
The public comment hearings will be held virtually. Spanish interpretation will be provided upon request. Registration is required using the following links.
Ozone public meetings
The CDPHE Air Pollution Control Division is holding public meetings in April, May, and June addressing ground-level ozone pollution. These meetings are set before a request for a hearing by the Air Quality Control Commission for proposed updates to Colorado’s State Implementation Plan.
Join an upcoming public meeting to learn more and share your thoughts on ozone pollution reduction efforts. The division is also offering 101 public information sessions for community members to learn about ozone in an accessible and plain language format.
Ozone 101 public information session
Ozone public meetings
The CDPHE Air Pollution Control Division is holding public meetings in April, May, and June addressing ground-level ozone pollution. These meetings are set before a request for a hearing by the Air Quality Control Commission for proposed updates to Colorado’s State Implementation Plan.
Join an upcoming public meeting to learn more and share your thoughts on ozone pollution reduction efforts. The division is also offering 101 public information sessions for community members to learn about ozone in an accessible and plain language format.
Ozone 101 public information session
Ozone public meeting
Ozone public meetings
The CDPHE Air Pollution Control Division is holding public meetings in April, May, and June addressing ground-level ozone pollution. These meetings are set before a request for a hearing by the Air Quality Control Commission for proposed updates to Colorado’s State Implementation Plan.
Join an upcoming public meeting to learn more and share your thoughts on ozone pollution reduction efforts.
View past public participation and outreach opportunities. These serve as a historic archive. These processes are completed.
Meeting accommodation notice
Auxiliary aids and services for individuals with disabilities may be provided upon request. Please notify cdphe_apcd_outreach@state.co.us and the Nondiscrimination Coordinator at cdphe_nondiscrimination@state.co.us or 303-692-2102 at least one week prior to the meeting to make arrangements.
Current projects
Environmental Justice Summary Dashboard
Most air pollution sources in Colorado must submit an environmental justice summary before applying for an air permit. That means environmental justice summaries provide early notice before the division receives an air permit application. The environmental justice summary dashboard allows users to find a specific facility by name or enter a zip code for a list of recent submissions within a one-mile radius.
Air permits open for public comment
The division opens numerous air permits for public comment each month. The division encourages anyone interested in air permits to visit the air permits public notices web page and sign-up to receive email updates by subscribing to Air Permit Public Notices. The division also shares upcoming public participation opportunities on its website and tips for submitting effective public comments.
Five-year air quality enforcement benchmark report
The division makes it easy for community members to learn about and stay informed about its enforcement work. A newly released benchmark report summarizes five years of the division’s previous enforcement actions, penalties, and trends. It covers federal fiscal years from October 1, 2018 through September 30, 2023. The report shows the total, average, and median penalties for air quality violations have been increasing over time.
The division will begin publishing an annual report each year covering air quality enforcement actions for the previous federal fiscal year. The first annual report will be released this spring.
Ongoing technical expert online meetings
Technical expert online meetings provide an opportunity to listen to in-depth discussions among subject matter experts. The experts discuss topics related to the division’s work on air quality and climate change. These meetings are streamed live or recorded for transparency. These meetings generally do not provide a public comment or question and answer session. To provide feedback to the division, explore the division’s public meeting opportunities above.
The Nitrogen Oxides (NOx) Reduction Steering Committee began meeting in March 2024. The members committed to holding meetings once a month for at least six months. During these meetings, members engage in technical discussions on potential strategies to reduce NOx pollution. The focus is on reducing NOx emissions from oil and gas exploration and production processes in Colorado.
Meetings are held virtually. Members of the public are welcome to observe.
For more information about meeting dates and how to register, visit the reducing nitrogen oxides from oil and gas web page.
Get involved: Air permit public notices
Visit the air permit public notices web page to:
- Submit public comments on individual air permits.
- Sign up for email notifications about air permit public notices and comment periods.
- Learn about, request, or register for public comment hearings on air permits.
More ways to engage with the state of Colorado
For a calendar of upcoming community engagement opportunities across the Colorado Department of Public Health and Environment, visit the department’s public participation website.
If you have questions or need to contact the air division, visit the division’s contacts website.
For upcoming Air Quality Control Commission public participation opportunities, visit the AQCC website.
For upcoming Colorado Energy and Carbon Management Commission hearings and public participation opportunities, visit the ECMC website.
For upcoming Public Utilities Commission hearings and public participation opportunities, visit the PUC’s website.
Colorado air quality regulation updates
The Air Pollution Control Division periodically proposes updates to existing air quality regulations to the Air Quality Control Commission. The commission reviews the proposals and determines whether to adopt any changes.
Many of these changes are minor or administrative. The division provides quick updates about these changes during public meetings. The commission’s website provides a calendar of upcoming meetings and more information on meeting topics.
The public can also learn more during the commission’s hearing requests and hearings. Visit the commission’s website and meeting calendar for more information.
To submit written public comments, email:
- cdphe.commentsapcd@state.co.us before a commission hearing request.
- cdphe.aqcc@state.co.us after a commission hearing request.
- Please include the Regulation Number “Public Comment” in the subject line.
Upcoming proposed changes to existing Colorado air quality regulations include:
- Proposed updates include:
- Considering revisions addressing emissions of ozone precursors.
- Hearing request date: November 20-22, 2024
- Questions or public comments? Email cdphe.commentsapcd@state.co.us before the commission hearing request date above.
- Hearing date: February 19-21, 2025
- Questions or public comments? Email cdphe.aqcc@state.co.us before the hearing date above.
- Proposed updates include:
- The air division will request that the commission set a hearing to consider establishing a new Regulation Number 31. The new regulation will address municipal solid waste landfill greenhouse gas control and monitoring requirements.
- Hearing request date: April 16-18, 2025
- Questions or public comments? Email cdphe.aqcc@state.co.us before the hearing date above.
- Hearing date: August 21-22, 2025
- Questions or public comments? Email cdphe.aqcc@state.co.us before the hearing date above.
- Proposed updates include:
- The Commission will consider revisions to Regulation Number 3 to address air toxics reporting, in response to House Bill 22-1244: Public Protections From Toxic Air Contaminants. This may also include revisions to Regulation Number 7.
- Hearing date: April 16-18, 2025
- Questions or public comments? Email cdphe.aqcc@state.co.us before the hearing date above.
Thank you for your interest in submitting comments to the air division. To protect public health and improve Colorado’s air quality, the division may present rules, permits, guidance documents, and other updates to communities so they can share their feedback and ask questions.
Our team values and considers every comment we receive.
Explore our web page. These tips are for written comments but can also be helpful when planning oral comments for a public meeting.
Questions? Email us at cdphe.commentsapcd@state.co.us.
Stay informed
Sign up for “General Air Division Updates” or a particular topic of interest. You’ll be one of the first to know about upcoming public participation opportunities.
- Join the air quality compliance and enforcement updates to learn about enforcement actions by the division.
- Join the air permit public notice list to receive updates on environmental justice summaries and permits open for public comment.
Contact us
Questions? Contact cdphe_apcd_outreach@state.co.us.
Stay informed. Subscribe to receive email updates from the division.