Using the studies published on the effectiveness of masks we determined the baseline values for the effectiveness of N95 respirators to be g s = 0.2 and g i = 0.5 and for the surgical masks g s = 0.02 and g i = 0.05 [12] . The effectiveness of masks in decreasing the infectivity of a sick individual is greater because the mask contains the virus particles, preventing them from becoming airborne, and therefore preventing the contamination of surrounding surfaces as well as people [30] .