·        Visible particles constitute only about 10% of indoor air.

·        Particle visibility depends on the eye itself. In other words, light intensity and quality, background and particle type.

·        Particles on furniture and those in a shaft of light are approximately 50 microns or larger.

·        It may be possible to see particles as small as 10 microns under favorable conditions.

·        Particles of 1 micron or less adhere to surfaces by molecular adhesion. 

·        Larger particles tend to settle out of the atmosphere due to weight.

·        Smaller, "respirable" particles remain suspended in the air virtually indefinitely - until breathed in.  

·        The average person breathes in about 16,000 quarts of air per day. Each quart contains some 70,000 visible and invisible particles. That's over a billion particles per day that our lungs have to filter out!

·        A 9' x 12' carpet or rug will collect an average of about 10 pounds of dust per year!

·        100% of all respiratory ailments and disease are caused by inhaled particulate.

      That's right, 100%!