The U.S. Environmental Protection Agency on Nov. 7 reinstated a 2009 action clarifying “project aggregation” for the New Source Review permitting program that governs emission permits for building new or significantly retrofitted industrial facilities including power plants. Under the policy, the agency will combine multiple changes to a facility into a single project for permitting considerations if they are “substantially related.” In 2010, the Obama Administration had proposed to revoke the project aggregation action. EPA’s move is the latest in a series of actions to update the permitting program, as part of the Trump administration’s efforts to reduce regulatory burden. In January, the agency removed a 1995 Clean Air Act provision that disallowed reclassification of facilities categorized as “major sources” of hazardous air pollution even after their emissions drop below the major source threshold level of 10 tons per year.