What is a micron?

A micron, also known as (µm), is a small unit of measurement for length. It is another name for micrometer, which is one-thousandth of a millimeter, or, one-millionth of a meter.  Airborne particles are usually described in microns.

The human eye can see debris and dust particles that are as small as approximately 25 microns in size. Particles smaller than 0.3 microns — much too small to see — are considered to be ultrafine particles. These smaller particles enter the body and travel through the bloodstream. They penetrate deep into the lungs and can potentially cause inflammation, heart disease, brain disease, and exacerbate pre-existing conditions. Children, elderly people, and people with lung problems like asthma are especially vulnerable. 

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