EPA wants to drop the 30-day public comment rule for new 'minor' polluters, including AI data centers

In 1970, Congress wrote a procedural safeguard into the Clean Air Act. Before any state could approve a new industrial facility near a community, the state had to give neighbors at least 30 days to weigh in. On July 1, 2026, the Environmental Protection Agency proposed removing that requirement for the very category, "minor sources," that today's large AI data centers are slotted into.

The proposal targets a 55-year-old part of the law called New Source Review, the same NSR program that historically blocked the dirtiest new power plants. NSR has a built-in exemption for "minor sources" of hazardous air pollutants, defined as facilities that emit less than 10 tons per year of any single listed HAP. Steel mills and data centers both fit that label on paper, even though their aggregate footprint is large.

EPA frames the change as "reducing administrative burden" and "putting state and local agencies most familiar with local issues in the driver's seat," according to the agency's press release on the proposal. The agency's argument is that the 30-day federal mandate is duplicative: states and counties can still choose to hold their own hearings. What the change actually removes is a default. If a state wants to skip public comment, the federal rule will no longer require it to hold a window at all.

A Financial Times analysis cited by Gizmodo's report on the proposal estimates that the 60 largest data centers currently under construction will together emit roughly 101.5 million tons of carbon dioxide per year once running. None of those projects, by the existing definition, would trigger the federal 30-day window.

The Southern Environmental Law Center filed a joint letter on August 21, 2026, signed by attorneys general from more than a dozen states plus the District of Columbia, New York City, and Chicago. The letter carries the title "Community Shutout" and argues that the federal 30-day window is the only notice many residents receive before a facility breaks ground. Roughly two hundred environmental and community groups signed the broader joint comments, which are available on SELC's site. E&E News reports the rule would let construction begin before air permits are finalized. K&L Gates, Crowell, and NSR Law have written client alerts characterizing the change as a meaningful shift in pre-construction practice, with Crowell reading the rule as effectively handing AI data center siting authority to states and localities to develop their own standards.

State and local agencies do retain full discretion to require hearings under their own rules, and many already do. A construction-industry trade group, SWACCA, frames the change as overdue modernization. EPA's stated goal is "supporting American economic development and energy dominance."

What the federal 30-day window added was a floor, not a ceiling. The loss is not that no community can comment. The loss is that no community is guaranteed the chance to comment before construction starts, and that guarantee is being lifted while AI infrastructure is being sited at a scale the 1970 rule's authors did not anticipate.

EPA's public comment window on the proposal is still open. State and local agencies still hold their own discretion. Those are the channels that remain.