USEPA Method 201A

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Determination Of PM10 Emissions (Constant Sampling Rate Procedure) – USEPA Method 201A

USEPA Method 201A is used to determine the particulate matter (PM) emissions equal to or less than an aerodynamic diameter of nominally 10 microns (PM10) from stationary sources.

A gas sample is extracted at a constant flow rate through an in-stack sizing device, which separates PM greater than PM10. Variations from isokinetic sampling conditions are maintained within well defined limits (±20%). The particulate mass is determined gravimetrically after removal of uncombined water.

The EPA recognizes that condensible emissions not collected by an in-stack method are also PM10, and that emissions that contribute to ambient PM10 levels are the sum of condensible emissions and emissions measured by an in-stack PM10 method, such as this method or USEPA Method 201. Therefore, for establishing source contributions to ambient levels of PM10, such as for emission inventory purposes, EPA suggests that source PM10 measurement include both in-stack PM10 and condensible emissions. Condensible emissions may be measured by an impinger analysis in combination with this method (USEPA Method 202).

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Last Update: October 25, 2006