 masks exhibited adequate filter performance and facial fit characteristics to be considered respiratory protection devices.‚Äù <a href="https://www.sciencedirect.com/science/article/pii/S0196655307007742">Tara Oberg &amp; Lisa M. Brosseau</a>&nbsp;<a href="#fnref31" rev="footnote">&#8617;</a></p>
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	<p>‚ÄúThe overall 3.4 fold reduction [70% reduction] in aerosol copy numbers we observed combined with a nearly complete elimination of large droplet spray demonstrated by Johnson 