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EPA/AR RIN: 2060-AO50 Publication ID: Fall 2010 
Title: Measurement of PM 2.5 and PM 10 Emissions by Dilution Sampling 
Abstract: This regulation describes the performance specifications and procedures for the measurement of particulate matter with an aerodynamic size cut of both 10 microns and 2.5 microns using a dilution air technique to cause the formation of condensable particulate matter. States which are in non-attainment of the national ambient air quality standards may need to test with this method to determine what contribution specific sources cause to the particulate matter burden. The use of dilution sampling was recommended by EPA’s Science Advisory Board. They believe that the dilution process simulates the formation process that occurs for particles in the ambient air. A cyclonic separator is used to separate the particulate matter into size cuts at 10 and 2.5 microns. The sample gas is then diluted and the condensable particles are formed and removed by filtration. These procedures are somewhat more complicated and costly but provide lower potential for artifact formation. Testing will be performed by the large emissions sources such as electric utilities, municipal incinerators, cement manufacturing, etc. in areas which do not meet the ambient air standards of the national ambient air quality standards. We do not plan to publish a proposal until the completion of the Method 201A/202 Revisions(SAN 5147) 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51 app M   
Legal Authority: 23 USC 101    42 USC 7401–7671q   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  05/00/2011    
Additional Information: SAN No. 5155
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 22 Utilities; 31-33 Manufacturing 
RIN Data Printed in the FR: No 
Agency Contact:
Jason Dewees
Environmental Protection Agency
Air and Radiation
E143-02,
Research Triangle Park, NC 27711
Phone:919 541-9724
Fax:919 541-0516
Email: dewees.jason@epa.gov

Candace Sorrell
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code E143-02,
Research Triangle Park, NC 27711
Phone:919 541-1064
Fax:919 541-0516
Email: sorrell.candace@epa.gov