4 The record articles

PM2.5: Repeal and Reminder

Posted: June 25th, 2011

Author: All4 Staff 

U.S. EPA has repealed the Prevention of Significant Deterioration (PSD) “Grandfathering” provision for particulate matter with an aerodynamic diameter of less than 2.5 microns (PM2.5). Facilities that submitted PSD construction permit applications prior to the promulgation of the PM2.5 New Source Review (NSR) regulations could demonstrate compliance with PM2.5 permitting requirements by addressing PM10 only, even if the final permit had not been issued after promulgation of the PM2.5 regulations. The relatively few applications that addressed PM10 only and that were still pending from a pre-PM2.5 rule adoption submittal will need to be revised to account for PM2.5 specifically. Although this action only impacts certain applications, it is important to remember that as of January 1, 2011, PM2.5 filterable and condensable emissions need to be evaluated and considered for PM, PM10, and PM2.5 emissions for all new source and modification applications. ALL4 will keep you posted on new interpretations and lessons learned as implementation of the PM2.5 rule continues. 


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