Introduction
•Bioaerosols, aerosols containing particles of biological origin, can cause infectious diseases and are of concern in dealing with indoor air pollution and bioterrorism.
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•Air filters have been designed to remove and inactivate particles, including bioaerosols, from indoor air. 
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•Ultraviolet germicidal irradiation (UVGI) is one possible method of controlling contamination in rooms and in buildings’ heating, ventilation and air conditioning (HVAC) systems by inactivating the bioaerosols.