Limit of viable particle count in compressed air validation

What is the limit of viable particle count in compressed air validation.
if the ans is acc to class or grade of that user point in which it is present than why so…when d air is not going to expose to that particular area, sampling is done directly into sampler.

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You can follow the ISO 8573 as per your requirement (dosage form manufacturing)

8573-1 doesnt have viable limits in it…it has non viable limits…

you can decide limit inhouse as per area usage