PQ of environmental

Is there any equation to determine number of worst locations in clean room

As per ISO-14644 give number of sampling location for Non-Viable particle count in clean room. However, the worst location would dependent on risk assessment. Usually entry & exit point, man & material movement point, product loading station near equipment are considered as worst location for performing microbiological test.

at the beginning thx a lot for ur interest,but for viable test (settle plate) no equation obtained to determine worst points