PAO test and Particle counter

How to perform PAO test and Particle counter…pls tell me in brief…what is upstream and downstream concentration?
How many volume collect by particle counter??

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hi
PAO test is performed to check filter integrity. Remove the Pre-filters and introduce the PAO smoke ie upsream at a concentration of 31 µgm / L into the blower inlet. Scan the HEPA filters and perimeters by using photometer ie downstream any smoke passing through the HEPA filter under test will enter the detection chamber of the photometer where the smoke concentration is measured.
Acceptance Criteria - Leak should not more than 0.01%.

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