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A new method is described for evaluating air filters with submicron aerosols. The method is unique in that the aerosols were viable, highly concentrated, and composed entirely of submicron particles (0.1 micron NMD). Tests were conducted to compare air filters in removing submicron Ti phage aerosols and bacterial aerosols of Bacillus subtilis var niger spores (1 micron NMD). Architects, engineers, and research investigators concerned with the control of submicron particles might consider filtration rather than other methods of air cleaning.

Effect of air ions on submicron Ti bacteriophage aerosols. Appl. Microbiol. 14:888-891. 1966.-The effect of a high concentration of ionized air molecules on sampling Ti phage aerosols of submicron particle size was evaluated by comparing the phage recoveries of all-glass impingers (AGI-4) and type 6 filter papers. Sampler recoveries of all ionized aerosols were less than the recoveries of nonionized control aerosols. These reductions in recovery were greater with positive ions than with negative ions or ions of mixed polarity. The AGI-4 allowed considerable slippage, which was not affected by the air ions. Type 6 filter paper recoveries were less than AGI-4 recoveries. The air ions did not appear to affect the aerosol particle size as determined by an electron microscope.

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