Ambient Air Monitoring Reference and Equivalent Methods; Designation of One New Reference Method and Three New Equivalent Methods

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 [FRL-13145-01-OAR] AGENCY: Environmental Protection Agency (EPA). ACTION: Notice. SUMMARY: Notice is hereby given that the U.S. Environmental Protection Agency (EPA) has designated one new reference method for measuring carbon monoxide (CO), one new equivalent method for measuring particulate matter (PM) 2.5 micrometers (µm) or less (PM 2.5 ), one new equivalent method for measuring PM 10µm or less (PM 10 ), and one new equivalent method for measuring PM 10-2.5 in ambient air. FOR FURTHER INFORMATION CONTACT: For further information about this notice, contact the Reference and Equivalency Methods Program, Air Quality Assessment Division, Office of State Air Partnerships, U.S. Environmental Protection Agency, P.O. Box 12055, 109 T.W. Alexander Drive, Research Triangle Park, North Carolina 27711. email address: FRMFEM@epa.gov . SUPPLEMENTARY INFORMATION: In accordance with regulations at 40 CFR part 53 , the EPA evaluates various methods for monitoring the concentrations of ambient air pollutants for which the Agency has established National Ambient Air Quality Standards (NAAQS) as set forth in 40 CFR part 50 . Air monitoring methods determined to meet specific requirements for adequacy are designated by the EPA as either reference or equivalent methods (as applicable), thereby permitting their use under 40 CFR part 58 by States and other air monitoring agencies for determining compliance with the NAAQS. A list of all reference or equ…