December 01, 2010

Methods for Measurement of Filterable PM10 and PM2.5 and Measurement of Condensable Particulate Matter Emissions from Stationary


  • On December 1, 2010, EPA revised two test methods for measuring particulate matter (PM) emissions from stationary sources.
  • One of the revised methods, called Method 201A, will provide the capability to measure the mass of filterable particulate matter that is equal to or less than 2.5 micrometers in diameter (PM2.5).
  • The second revised method, called Method 202, will make a more accurate measurement of condensable particulate matter. Condensable particulate matter forms from condensing gases or vapors. It is a common component of both PM10 (particulate matter equal to or less than 10 micrometers in diameter) and PM2.5.
  • The combination of Methods 201A and 202 will allow EPA and States to:
    • develop more accurate primary PM emissions inventories,
    • determine whether stationary sources are major sources of PM10 or PM2.5 emissions for the New Source Review/Prevention of Significant Deterioration program or the Title V Permit program,
    • determine more accurately the effectiveness of control devices for PM10 or PM2.5,
    • develop regulatory limits with more appropriate test methods, and
    • determine compliance with regulatory limits with greater accuracy.
  • In this notice we also announced that we are taking no action to end the transition period for condensable particulate matter in the New Source Review (NSR) program earlier than the current end date of January 1, 2011.

Client Portal



New Client? Request Access Now >>