In July we noted that Scott Pruitt released a memo on March 13 to change how industries calculate whether increases in air pollutants from source modifications will trigger an EPA permitting program called new source review (NSR).

The EPA is looking at revising the air pollution permitting program, NSR, beyond the memo by proposing a rule change (RIN:2060-AT89). The proposal requests a revision to how large industrial sources, such as power plants and boilers, calculate changes in their emissions that might trigger requirements that they install new air pollution controls.

RIN: 2060-AT89 is proposing the consideration of emissions increases and decreases from a modification when determining if theire is a “significant emission increase” of a regulated NSR pollutant.