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Air Quality Improvement Planning

Emissions Inventories

Revised On: Apr. 21st, 2026 - 10:49 am

An emissions inventory is an accounting of all permitted air pollutant emissions actually released into the atmosphere. This accounting forms the basis for air quality planning that occurs at county, state, and national levels. Pursuant to Arizona Administrative Code (A.A.C.) R18-2-327, any source subject to a permit may also be required to complete and submit an annual Emissions Inventory Questionnaire (i.e., Reporting Methods and Forms) to ADEQ | View A.A.C. R18-2-327 >

Does my Facility Need to Report?

Some, but not all, ADEQ air permit holders are required to report their 2025 emissions to ADEQ.

  • Class I permit holders are required to report emissions annually.
  • Class II permit holders are required to report at least once every three years, but may be required to report more frequently at the Director’s discretion. 
  • Emissions may still be required to be reported, even if the air quality permit is now closed.

If you are unsure whether you are required to report your 2025 emissions, please consult the reporting guide | View Reporting Guide >

Emissions Inventory Reporting Methods and Forms

If you are required to report a 2025 emissions inventory, your report must be submitted by June 1, 2026, via one of the following methods:  

  • Non-Operational — Facilities that did not operate the entirety of 2025 | View Non-Operational Form (PDF) >
  • Combined Air Emissions Reporting System (CAERS) — If ADEQ has enrolled your facility in the CAERS reporting system and you are new to CAERS reporting, use this form to request an emissions inventory report preparer or certifier role for your facility in the CAERS web application. Email a signed copy to ADEQ’s Emissions Inventory team | View CAERS User Application Form (PDF) > | Email ADEQ’s Emissions Inventory Team >
  • Rock Product General Permit Holders — myDEQ’s year-end permit compliance certification process includes the review and certification of an Emissions Inventory report for the preceding year. Year-end compliance certifications must be completed in myDEQ each January. No additional annual Emissions Inventory reporting is required once that process is complete | Log in to myDEQ > | How to Get a myDEQ Account >
  • All Other Reporters — Facilities that fall into this category should download an Annual Emissions Inventory Questionnaire (AEIQ) each year to ensure accurate reporting. The latest year may include revisions and/or updates to calculation methodologies. The AEIQ is provided in an Excel version (preferred by ADEQ) and a PDF version. Please complete the AEIQ per its README instructions and email a signed copy to ADEQ’s Emissions Inventory team | Email ADEQ’s Emissions Inventory Team >

    • The Excel version of the AEIQ will auto-calculate emissions based on reported activity levels and is therefore the preferred version | Download AEIQ (Preferred Version – Excel) >
    • The PDF version of the AEIQ is primarily reserved for facilities that do not have access to Microsoft Excel software. The PDF version will not auto-calculate emissions. The Emissions Inventory team will use the reported activity data to calculate emission totals for the facility | View AEIQ (PDF) >

Emissions Inventory Training

Workshops and Helpful Resources

Annual Emissions Inventory Reporting by CAERS:

Emissions Inventory Reporting by AEIQ (both Excel or PDF versions) or myDEQ: 

Online Consultations 

ADEQ welcomes emission inventory reporters to schedule one-on-one online consultations with our staff. During the consultation, we can address emission inventory questions, clarify requirements, discuss inventory preparation and submission best practices, troubleshoot errors, etc. | Book a Consultation >

Guidance Documents

Subscription to ADEQ's Emissions Inventory Mailing List

For more information, join our email list. When selecting subscription topics, select Air Quality, proceed to the next page(s), select Other Air Quality Topics and then select Annual Emission Inventory Questionnaire where listed | Subscribe >

Questions?

Please email the Emissions Inventory team | Email >

Emissions Inventory Team
Email >

Agricultural Dust Program >
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Dust Pollution Prevention >
Emissions Inventories >
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