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Type              Microns (diameter)    Time to Settle
      
Skin Flakes          20 - 50                   5 seconds
Dust                      >10  
Pollens                15-25  
Mite Allergens      10-20                    5 minutes
Common Spores    2-10  
Bacteria                 1-5  
Cat Dander             0.5-1.5               10 hrs
Tobacco Smoke     0.1-1  
Metal Fumes           <1  
Cell Debris            0.01-1  
Viruses                  <0.1                  10 days







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