You need to understand what type of air borne viable you are trying to resist and then get some Agar settlement plates loaded with the correct bio culture for placement in the process.
These will then be placed in strategic places after room construction and cleandown. The correct location will be defined by doing an assessment into the most Hazardous part of the process (HACCP) . Hazard Analysis Critical Control Point.
You then need to have the cultures processed by a bio lab to establish the background bio burden. You will repeat this a few times to identify and fix their hot spots before start up.
When in action you can use an automatic airborne impinger sampler to monitor their process in terms of cfu. sq deci.m. Its a very complicated process and they have to keep strict records of all their results, including the straight forward particle counts.
Regards,
Dick Gibbons (committee member of the BSI LB I 30 in the UK and convenes 14644 part 8 and 10 for Chemical contamination)