Applicability: You can use this method to measure filterable particulate matter from stationary sources only. Filterable particulate matter is collected in-stack with this method (i.e., the method measures materials that are solid or liquid at stack conditions). 

Summary: To measure PM10 and PM2.5, extract a sample of gas at a predetermined constant flow rate through an in-stack sizing device. The sizing device separates particles with nominal aerodynamic diameters of 10 microns and 2.5 microns. To minimize variations in the isokinetic sampling conditions, you must establish well-defined limits. Once a sample is obtained, remove uncombined water from the particulate, then use gravimetric analysis to determine the particulate mass for each size fraction. This method changes Method 201A of Appendix M to 40 CFR part 51 filterable particulate procedures with the addition of a PM2.5 cyclone from a conventional five-stage cascade cyclone train. The addition of a PM2.5 cyclone between the PM10 cyclone and the stack temperature filter in the sampling train supplements the measurement of PM10 with the measurement of fine particulate matter.

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