The EPA is concerned the changes made last year to its “aggregation policy” would make the agency’s New Source Review (NSR) permitting program less effective, allowing facilities to increase emissions that may impact air quality without a thorough review.

The new proposal responds to a petition to reconsider the 2009 rule. The 2009 rule directed facilities and permitting authorities to combine emissions from construction projects only when the changes are “substantially related,” such as having more in common than the timing of construction.

The EPA is proposing to go back to its original policy, which required combining projects based on a broader range of factors. This would ensure potential emissions increases that could harm air quality do not avoid review and the installation of state-of-the-art pollution controls.

The EPA also is proposing to extend the effective date of the 2009 aggregation rule for an additional six months, to give the agency time to complete the reconsideration. The EPA will take comment on the proposal rule for 30 days after it is published in the Federal Register. For more information, go to: