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Air permits for non-oil and gas

Air Pollutant Emissions Notice (APEN) forms

For detailed step-by-step guidance on submitting APENs and permit application forms, please visit Guide for Colorado Businesses: Required air forms.

The CDPHE Air Pollution Control Division is currently transitioning to electronic forms. Please view the Electronic submission web page to see if the form you need is available electronically. If the form is not listed, complete and email the final PDF version to cdphe_apcd_ssp_application@state.co.us or by standard mail.

The new online submission tool is part of the division’s multi-year data modernization project. It involves updating, enhancing, and streamlining a variety of processes, including permitting. The data modernization work is ongoing, and the division anticipates completing most of the transformation by 2027.

Choose the appropriate APEN below. If you do not see an APEN that fits your operation or equipment, use the General APEN form. 

Boiler APEN: Form APCD-220.

Use this form to report boilers, hot oil heaters, process heaters and other similar equipment.

Use the boiler emissions calculator to calculate emissions for boilers rated under 100MMBtu.

Guidance:

Fuel burning equipment that uses gaseous fuel, is rated ≤10,000,000 Btus per hour, and that is used only for heating buildings for personal comfort.

APEN exemption: Fuel burning equipment that uses gaseous fuel, is rated ≤10,000,000 Btus per hour, and that is used only for heating buildings for personal comfort.

  • Reference: Regulation 3 Part A II.D.1.ggg. 

NESHAP JJJJJJ

  • If you own or operate a boiler, you may be subject to federal environmental regulations. EPA promulgated National Emission Standards for Hazardous Air Pollutants (NESHAP) JJJJJJ for industrial, commercial, and institutional boilers located at facilities that emit less than 10 tons per year of any Hazardous Air Pollutant (HAP) or less than 25 tons per year of combined HAPs. This rule does not apply to electric or gas fired boilers.
  • Guidance document
    • An overview of national emission standards for hazardous air pollutants (NESHAP) JJJJJJ, area source boiler rule.
  • Electronic initial notification- external link.
    • If you are subject to NESHAP JJJJJJ, an initial notification shall be submitted to both EPA and the Colorado Air Pollution Control Division. Initial notifications shall be submitted electronically to the EPA through the EPA's Compliance and Emissions Data Reporting Interface (CEDRI). Mail a copy of the initial notification to the Colorado Air Pollution Control Division at Colorado Department of Public Health & Environment APCD-SS-B1 4300 Cherry Creek Drive South Denver, CO 80246-1530.

This form is available online and in PDF format. Use the Crematory/Incinerator APEN: Form APCD-234 PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

If you prefer to submit your form online, submit the Crematory/Incinerator APEN: Form APCD-234 form with the online submission tool.

Regulatory Requirements Specific to Incinerators

An Air Pollutant Emission Notice must be filed for all incinerators.

  • Reference: Regulation 3, Part A, Section II.D.2.

All incinerators require a permit.

  • Reference: Regulation 1, Section III.B.1., and Regulation 3, Part B, Section II.D.6.

Guidance

This form is available online and in PDF format. Use the Crusher/Screen APEN: Form APCD-221 PDF version if you prefer the traditional format and email the completed form to cdphe_apcd_ssp_application@state.co.us.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

If you prefer to submit your form online, submit the Crematory/Incinerator APEN: Form APCD-234 form with the online submission tool.

Guidance

Spark Ignition Engine APEN: Form APCD-201.

Calculate your natural gas-fired engine emissions.

General Permit.

General permits offer a streamlined approach. Sources that can meet the criteria of emissions limitations and other operating conditions may qualify for a general permit. 

Compression Ignition Engine APEN: Form APCD-233.

Guidance:

Diesel engines that are subject to New Source Performance Standard Subpart IIII must submit the APEN Addendum Form APCD-214 along with the engine APEN (Form APCD-233).

General Permit.

General permits offer a streamlined approach. Sources that can meet the criteria of emissions limitations and other operating conditions may qualify for a general permit. 

Calculate emissions for diesel engines:

Permit Exemptions

Stationary Internal Combustion Engines that: 

  • Are power portable drilling rigs; or are emergency power generators that operate no more than two hundred and fifty hours per year; or have uncontrolled actual emissions less than five tons per year or manufacturer’s site-rated horsepower of less than fifty are exempt from requiring a Permit.
    • Reference: Regulation 3 Part B II.D.1.c.(i-iii)
       

Facility-Wide Greenhouse Gas Emissions APEN: Form APCD-235.

Submit this notice to report facility-wide greenhouse gas emissions. This emission notice is required to be submitted annually on or before December 31 of each year, starting on or before December 31, 2023, for facilities directly emitting CO2e emissions equal to or greater than 25,000 metric tons per year. See Colorado AQCC Regulation No. 3, Part A, II.A.2. for additional information.

This form is available online and in PDF format. Use the Fuel station APEN: Form APCD-229 PDF version if you prefer the traditional format and email the completed application to cdphe_apcd_ssp_application@state.co.us.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

If you prefer to submit your form online, submit the Fuel Station APEN: Form APCD-229 form with the online submission tool.

Guidance

Permit exemption

Gasoline stations located in ozone attainment areas are exempt from needing a Permit, except for stations located in the Denver 1-hour ozone attainment/maintenance area.

  • Reference: Regulation 3, Part B, Section II.D.1.f.

Grain elevators & feed mills APEN: Form APCD-230.

Use this form for:

  • Food/beverage processing plants that handle grain.
  • Large grain elevators and feed mills.
  • Pet food manufacturing plants.
  • To report grain handling activities, including receiving, shipping, storage, cleaning, milling, grinding, handling (headhouse, elevators, conveyors), drying, flaking, or cooling.

Report grain handling activities, including receiving, shipping, storage, cleaning, milling, grinding, handling (headhouse, elevators, conveyors), drying, flaking, or cooling.

This form is available online and in PDF format. Use the Land Development APEN: Form APCD-223 PDF version if you prefer the traditional format and email the completed application to cdphe_apcd_ssp_application@state.co.us.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

If you prefer to submit your form online through the new streamlined process, submit the Land Development APEN: Form APCD-223 form with the online submission tool.

Requirements specific to land development activities

  • Disturbances of surface areas for purposes of land development that do not exceed twenty-five contiguous acres and that do not exceed six months in duration are exempt from the requirement to submit an Air Pollution Emission Notice (APEN) and the requirement to obtain a construction permit. (Reference: Colorado Regulation 3, Part A, Section II.D.1.j. and Part B, Section II.D.1.a.)
  • Form APCD-223 is intended to be used for activities associated with land development, including but not limited to foundation excavation, site grading, paving, and other related processes. It is not intended to be used for sources that will operate indefinitely - i.e., mining operations.

Guidance

Mining operations APEN: Form APCD-222.
This form is for sand and gravel pits and surface coal mines.

Use the Crushers and screens APEN: Form APCD-221 to report crushing, screening, or other equipment operating at the site.

Guidance:

Permit Exemption
Surface mining activities that mine seventy thousand tons or fewer of product material per year are exempt from requiring a Permit. A fugitive dust control plan is required for such sources. Crushers, screens, and other processing equipment activities are not included in this exemption. 

  • Reference: Regulation 3 Part B II.D.1.g.

Use this form to report:

  • Cleaning solvent usage.
  • Coating.
  • Painting.
  • Volatile materials usage operations. 

This form is available online and in PDF format. Use the Surface Coating and Solvent Usage APEN: Form APCD-226 PDF version if you prefer the traditional format and email the completed application to cdphe_apcd_ssp_application@state.co.us.

For detailed step-by-step guidance on completing the form submission process, visit the Guide for Colorado Businesses: Required air forms web page.

If you prefer to submit your form online through the new streamlined process, submit the Surface Coating and Solvent Usage APEN: Form APCD-226 form with the online submission tool.

Guidance

Regulatory exemptions

Chemical storage tanks or containers that hold less than five hundred gallons and have an annual average daily throughput of less than twenty-five gallons are exempt from requiring an APEN and the requirement to obtain a construction permit..

  • Reference: Regulation 3, Part A, Section II.D.1.n., and Part B, Section II.D.1.a.

Chemical storage areas where chemicals are stored in closed containers and the total storage capacity does not exceed five thousand gallons are exempt from requiring an APEN and the requirement to obtain a construction permit. This exemption applies solely to the storage of such chemicals. This exemption does not apply to the transfer of chemicals from, to, or between such containers. 

  • Reference: Regulation 3, Part A, Section II.D.1.mm., and Part B, Section II.D.1.a.

Adhesive use that is not related to production is exempt from requiring an APEN and the requirement to obtain a construction permit.

  • Reference: Regulation 3, Part A, Section II.D.1.y., and Part B, Section II.D.1.a.

Contact us

Questions? Email cdphe_apcd_sbap@state.co.us.
Phone: 303-691-4951

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