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APENs and air permits

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Update: Environmental Justice Summary Requirement for Air Quality Regulation 3

Starting July 15, 2023, all applicable permit applicants must submit an Environmental Justice Summary prior to submitting their permit application. The Air Pollution Control Division’s Environmental Justice Report Tool for Air Quality Regulation 3 is designed for permit applicants to use when implementing the Disproportionately Impacted (DI) Community Permitting Rule. The tool’s website has additional information including steps for submitting a complete environmental justice summary, user guide, FAQs, and more.

Questions? Email cdphe_apcd_ejreports@state.co.us with “EJ Summary” and the facility name in the subject line. Small businesses can contact the Air Pollution Control Division’s Small Business Assistance Program for assistance: cdphe_apcd_sbap@state.co.us.

Note: If a modeling determination (form APCD-114) is required for the emission source, you should submit your modeling determination request at the same time you submit the Environmental Justice Summary by following the instructions on form APCD-114. If you are unsure whether a modeling determination is required for this emission source, please consult the Air Pollution Control Division’s Air Quality Modeling Guidance for Permits web page.

Any business in Colorado that emits air pollution may be required to report its emissions and/or apply for a permit. Submitting an Air Pollutant Emissions Notice (APEN) is required to report your emissions, apply for a permit, or modify a permit. Your APEN will be rejected if it is filled out incorrectly, is missing information, or lacks payment for the filing fee. The re-submittal will require a new filing fee. See our Application Rejection Frequently Asked Questions for more information.

Do you need an APEN or air permit?

  • Introduction to APENs video.
  • Detailed guidance for calculating your emissions.
  • APEN/permit threshold table.
  • Ozone non-attainment area boundaries.
  • Common APEN and air permit exemptions.
  • APEN update guidance.

Severe Nonattainment Area Reclassification: Permitting Issues - PS Memo 22-01

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Resources

Permits

  • Find forms to apply or modify (including APENs), and permitting process guidance.

Oil & gas APENs

  • If you just need an APEN and are not applying for a permit.

General permits

  • General permits offer a streamlined approach, they're available for land development activities, diesel engines, natural gas RICE engines and other oil and gas operations. Sources that can meet the criteria of emissions limitations and other operating conditions may qualify for a general permit.

Administrative changes

  • Cancel, change ownership or company name, provide notice of startup, alternate operating scenario, relocation notice, or self-certify.

Additional resources

APENs

  • Find Air Pollutant Emission Notices (APENs) and resources to apply for, modify or renew a permit

General permits

  • General permits offer a streamlined approach, they're available for land development activities, diesel engines, natural gas RICE engines and other oil and gas operations. Sources that can meet the criteria of emissions limitations and other operating conditions may qualify for a general permit.

Administrative changes

  • Cancel, change ownership or company name, provide notice of startup, alternate operating scenario, relocation notice, or self-certify.

Additional resources