Mississippi Commission Eyes Stricter Air Rules After Plant Violations

JACKSON, Miss. -- The Mississippi Commission on Environmental Quality (MCEQ) proposed stricter air quality regulations for industrial facilities on April 25, 2026, following a series of violations at plants across the state. The move targets major emitters in DeSoto County and the Gulf Coast, including a Dutch Oil Company facility cited in an April 14 Agreed Order for exceeding emission limits on volatile organic compounds. MCEQ's Air Division, responsible for enforcing the Mississippi Air and Water Pollution Control Act, flagged 17 facilities last quarter for non-compliance with National Ambient Air Quality Standards (NAAQS) on criteria pollutants like particulate matter and nitrogen dioxide.

Spurred by House Bill 1486 introduced in the 2024 legislative session, the proposals mandate MDEQ to evaluate at least 15 toxic air pollutants annually, setting threshold exposure levels by July 1, 2025. The bill requires listing up to five high-risk contaminants, prioritizing risks to infants and children from combined exposures, with updates due yearly. Ambient monitoring at 12 Mississippi sites shows elevated ozone levels in the Jackson metro area, exceeding EPA secondary standards 15% of the time in 2025. Officials cite these lapses as fueling respiratory issues in local communities like South Jackson.

Industry groups warn the rules could raise costs for refineries near Pascagoula, where Title V permits already demand case-by-case Maximum Achievable Control Technology assessments. MCEQ Chair Dr. Gary Rikard emphasized public health in a commission hearing, noting Mississippi's standards mirror EPA's primary NAAQS except for odor controls under 11 Miss. Admin. Code Pt. 2, Ch. 4. Public comments close May 15, with adoption eyed for summer amid pressure from SuperTalk Mississippi's initial reporting on the violations.