Glossary according USP 38
GLOSSARY FOR MICROBIOLOGICAL AIR ENVIRONMENTAL MONITORING Microbiology according USP 38 – The United States Pharmacopeial – Document (1116) Aseptic Processing Environments - Page 1201, 1202. Airborne Particulate Count – The total number of particles of a given size per unit volume of air. Airborne Viable Particulate Count – The recovered number of CFU per unit volume of air. Air Changes – The frequency per unit of time that the air within a controlled environment is replaced. The air can be recirculated or totally replaced.