Maximize your returns! File your taxes securely and for free at GetAheadColorado.org.

 
1

Air Quality Modeling Guidance for Permits

#FFFFFF

Current air quality permit modeling guidance for estimating impacts from stationary sources of air pollution.

#FFFFFF

General Permitting Questions

#FFFFFF

Colorado Modeling Guidance for Air Quality Permits

  • MINOR UPDATE: Colorado Minor NSR Source Modeling Guideline for Air Quality Permits (May 2023 (minor Revision (Appendix C) February 2024)
  • Call to Action for Outstanding Applications
  • Permit Modeling Unit (PMU) Determinations.
    • Traditional Construction Permits
      • If an applicant is unsure if modeling will be required to conduct a required NAAQS analysis, the APCD-114 Form (updated December 14, 2023) should be filled out to obtain a decision prior to submitting a permit application or a Modeling Analysis to the Air Pollution Control Division (Division). Form Instructions are provided here. Additional clarification can be found here
      • Once a determination is made, the applicant will be provided documentation of the PMU Determination by Division. The APCD-114 Form and PMU Determination must be included in the permit application and will be part of the source or modification's permit application record. If a determination of "Modeling Required" is made, the applicant must submit a Modeling Analysis demonstrating compliance with the NAAQS with the permit application. If a determination of “Modeling Not Required” is made, the completed APCD-114 Form and PMU Determination, which demonstrates NAAQS compliance, will be included as part of the source or modification’s permit application record and no further analysis will be required. 
    • New General Permit Registrations: GP01, GP02, GP05, GP06, GP07, GP08, GP09, GP10 and GP11
      • In order to evaluate if modeling will be required to conduct a required NAAQS analysis pursuant to the Colorado Minor NSR Source Modeling Guideline for Air Quality Permits (May 2023), the APCD-114 Form (updated December 14, 2023) should be filled out to obtain a decision prior to submitting a general permit registration  or a Modeling Analysis to the Air Pollution Control Division (Division). Form Instructions are provided here. Additional clarification can be found here
      • Once a determination is made, the applicant will be provided documentation of the PMU Determination by the Division. The APCD-114 Form and PMU Determination must be included in the general permit registration and will be part of the source’s permit application record. If a determination of “Modeling Not Required” is made, the completed APCD-114 Form and PMU Determination will be included as part of the source or modification’s permit application record and no further analysis will be required. If a determination of "Modeling Required" is made, the applicant must submit a Modeling Analysis demonstrating compliance with the NAAQS to the Division and obtain a Modeling Review Report, which is written approval of the Modeling Analysis, prior to submitting a general permit registration. The Modeling Review Report or determination of “Modeling Not Required” must be submitted with the General Permit registration for the registration to be complete.
#FFFFFF

Supplemental Modeling Guidance, Maps, Forms, and Information

#FFFFFF

Meteorological & Geophysical Data for Air Quality Permit Modeling

#FFFFFF

Federal Modeling Support