In a matter of a few weeks, the US Environmental Protection Agency (EPA) has proposed several actions that could have dramatic impacts for facilities subject to Clean Air Act New Source Review (NSR) provisions (i.e., major sources of air pollutant emissions). These actions address the grandfathering provision for fine particulate emissions, the fugitive emissions rule and the aggregation rule. To wit:
- On February 4, EPA proposed to repeal the NSR “grandfathering provision” for emissions of particulate matter less than 2.5 microns, or micrometers, in diameter (PM2.5), commonly termed “fine particulates.” The rule had allowed permit applicants to rely on permitting requirements for “coarse particulates” – particulate matter 10 microns or less in diameter, or PM10 - as a surrogate for PM2.5 requirements if the application had been submitted prior to July 15, 2008. The EPA proposal also will end the “PM10 surrogate policy” by no later than May 2011, eliminating the use of PM10 as a substitute for PM2.5 analysis in State permitting programs.


