Environment monitoring of clean room

How can define the alert limit and action limit of environment monitoring ?

Use 3 sigma method to define the alert and action limits.

Is there need to define the alert and action limits every year on the basis of trend data of environment monitoring ?

It is better to update the limits if there is any major change in count.

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please I want the reference of microbial monitoring in clean room and the limit for of air and building and machine monitoring


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