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On Thursday, the EPA proposed amendments to Methods 201A and
202 that would add a particle-sizing device to allow for sampling of
particulate matter (PM) with mean aerodynamic diameters less than or equal to
2.5 micrometers.
The proposed amendments to Method 202 would revise the sample collection and recovery procedures of the method to reduce the formation of reaction artifacts that could lead to inaccurate measurements of condensable particulate matter (CPM), according to the agency. Additionally, the changes to Method 202 would eliminate most of the hardware and analytical options in the existing method. The EPA said it believes this would increase the precision of the method, and improve the consistency in the measurements obtained between source tests performed under different regulatory authorities.
The agency also is soliciting comments on whether to end the transition period for CPM in the New Source Review (NSR) program on a date earlier than the current end date of Jan. 1, 2011. Comments must be received on or before May 26, 2009.
The proposed amendments to Method 202 would revise the sample collection and recovery procedures of the method to reduce the formation of reaction artifacts that could lead to inaccurate measurements of condensable particulate matter (CPM), according to the agency. Additionally, the changes to Method 202 would eliminate most of the hardware and analytical options in the existing method. The EPA said it believes this would increase the precision of the method, and improve the consistency in the measurements obtained between source tests performed under different regulatory authorities.
The agency also is soliciting comments on whether to end the transition period for CPM in the New Source Review (NSR) program on a date earlier than the current end date of Jan. 1, 2011. Comments must be received on or before May 26, 2009.
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