Indoor bioaerosol dynamics

Nazaroff, William W

Regarding removal processes, the primary control alternatives are three, which appear in the denominator of equations (1) and (2): (i) increase the outdoor air ventilation rate (typically either Q N or Q M ); (ii) use recirculating air filtration (i.e., introduce or enhance g R Q R , where g R is the filtration efficiency, as illustrated in Figure 12 , and Q R is the recirculating flow rate through the filter; or (iii) enhance the rate of deposition or degradation of the bioaerosol attribute (thereby increasing b). Miller-Leiden et al. (1996) explored the effectiveness of in-room recirculating filtration for controlling the transmission of tuberculosis. Cheng et al. (1998) have evaluated the use of portable air cleaners for reducing indoor concentrations of fungal spores. Ultraviolet germicidal irradiation can be applied to reduce the infectivity of air without actively removing the bioaerosol particles (Reed, 2010) .