Implementation of the New Source Review (NSR) Program for Particulate Matter Less Than 2.5 Micrometers (PM2.5): Amendment to the Definition of “Regulated NSR Pollutant” Concerning Condensable Particulate Matter

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Parts 51 and 52 [EPA-HQ-OAR-2003-0062; FRL-9742-8] RIN 2060-AR30 AGENCY: Environmental Protection Agency (EPA). ACTION: Final rule. SUMMARY: The EPA is issuing a final rule that revises the definition of “regulated NSR pollutant” contained in two sets of Prevention of Significant Deterioration (PSD) regulations and in the EPA's Emission Offset Interpretative Ruling. The revision corrects an inadvertent error made in 2008 when the EPA issued its rule to implement the New Source Review (NSR) program for fine particles with an aerodynamic diameter of less than or equal to 2.5 micrometers (PM 2.5 ). This revision removes a general requirement in the definition of “regulated NSR pollutant” to include condensable PM when measuring one of the emissions-related indicators for particulate matter (PM) known as “particulate matter emissions” in the context of the PSD and NSR regulations. However, the rule preserves the requirement in some particular cases to include condensable PM in measurements of “particulate matter emissions” as required by other regulations. In addition, measurement of condensable PM continues to be required in all cases for two other emissions-related indicators for emissions of PM—emissions of particles with an aerodynamic diameter of less than or equal to 10 micrometers (PM 10 emissions) and PM 2.5 emissions. DATES: The amendments to 40 CFR parts 51 and 52 are effective …