Mississippi Judge Lets NAACP Clean Air Act Case Against X.AI Proceed

A Mississippi federal judge let two NAACP groups’ Clean Air Act lawsuit proceed, rejecting X.AI Corp. and MZX Tech LLC’s bid to dismiss allegations about unpermitted turbines serving AI data centers near Memphis.

The opinion, released Friday, Oct. 30, found that the plaintiffs have standing under the Clean Air Act. The judge also ruled that the turbines do not qualify as “mobile sources” under Mississippi’s state implementation plan and rejected arguments that the law’s citizen-suit provision violates Article II or the private nondelegation doctrine. The ruling allows the claims to move forward; it does not establish that the companies violated the law.

The National Association for the Advancement of Colored People and the Mississippi State Conference of the NAACP filed the case on April 14, 2026. They allege X.AI Corp. and MZX Tech LLC installed and operated 27 gas turbines in Southaven, Mississippi, from August to December 2025 without an air permit. The plaintiffs also allege the turbines powered AI data centers in the Greater Memphis area and emitted smog-forming pollutants and particulate matter that could pose health risks and cause unpleasant odors.

In a June motion to dismiss, the companies argued that the turbines were mobile sources exempt from permitting requirements. They also challenged the plaintiffs’ right to sue and argued that citizen suits brought by community groups are unconstitutional. The judge rejected those arguments at this stage of the case.

The decision follows an Oct. 19 order allowing the federal government to join the case while denying its request to end it. The claims against X.AI Corp. and MZX Tech LLC will now proceed in federal court.