Mississippi AERF Process Changes

In April 2025, the Mississippi Department of Environmental Quality (MDEQ) announced updates to the annual emissions reporting form (AERF) submittal process. In accordance with 11 Miss. Admin. Code Pt. 2, R,6.6, Title V Program sources must submit a completed reporting form with an inventory of the previous calendar year’s emissions and supporting information by July 1^st to use actual emissions as the basis of the emissions portion of the Title V Program fee.

What Has Changed?

Several important changes to the AERF process are now in effect:

• 2025 will be the last year a physical AERF letter will be mailed to facilities subject to the Title V Program. Beginning in 2026, the Title V program fee assessment contact on record will receive an email reminder in early April.
• MDEQ will no longer mail a facility-specific AERF to facilities subject to the Title V Program. Instead, a generic AERF was included with the reminder letter this year and will be available on MDEQ’s Title V Fees page in future years.
• Beginning in 2025, all AERFs must be submitted through the MDEQ’s new online AERF Submittal Portal.

What is the Difference Between the AERF and AERR?

The Air Emissions Reporting Requirements (AERR) are federal reporting requirements mandated by the Clean Air Act Amendments of 1990. AERR is separate from the AERF and requires Title V facilities to report actual air emissions on a periodic basis. All Title V facilities are required to report triennially. However, certain larger Title V facilities are required to report annually. The potential emissions thresholds that determine if reporting is required annually or triennially are found in Appendix A of 40 CFR Part 51, Subpart A.

Facilities must report air emissions using the Combined Air Emissions Reporting System (CAERS), an online portal to streamline both annual and triennial reporting in accordance with the AERR Rule. For more details on how Mississippi uses CAERS for emissions reporting, see our earlier blog post: Now Boarding: Mississippi Facilities to CAERS Version 5.

What Are the Next Steps?

To ensure compliance with the updated AERF submittal process, facilities subject to the Title V Program should review their internal procedures for tracking and reporting emissions. Verify that your facility has accurate emissions data from the previous calendar year and that the appropriate personnel are aware of the July 1st submission deadline and the requirement to use the online submission portal. As MDEQ transitions away from physical mailings, confirm that your Title V program fee assessment contact information is up to date to receive future email reminders.

ALL4 is here to help your team submit your facility’s AERF and can help facilitate your company’s environmental compliance. The ALL4 team has experience assisting facilities in Mississippi with both state and federal environmental requirements. If there are any questions about the updated AERF process and how your Facility may be affected, or if you’d like assistance with your air emissions inventory or an upcoming air quality project, please reach out to me at cgregory@all4inc.com or your ALL4 project manager for more information.