What is a Micron?

Micron is a length measurement unit
A micron is a unit of length equivalent to a millionth of a meter.
Red blood cells are approximately 10 microns in diameter. Human hair is between 10 and 100 microns in diameter.

 A “micron” is a unit of measurement of the size of a particular unit of water contamination. A small pebble has a much higher micron size number than the microscopic bacteria that might be in your drinking water.


Why is Micron Size Important?

What you need to know about Micron Size

What exactly is a micron?

Actually, a micron isn’t a ‘thing’ but a unit of measurement.  Micron is short for a micrometre which is one-millionth of a metre.  Micron sizes are the typical measurements used when discussing the level of filtration that an air cleaner is capable of achieving.


So exactly how BIG is a micron?

A micron is a VERY small measurement.  To give some idea, the eye of a needle is about 1,230 microns and human hair ranges between 40 and 600 microns.  Most particles that allergy sufferers routinely worry about are much smaller on average, such as pollen (30 microns), dust (10), mold spores (10), pet dander (5) and bacteria (1).  Click HERE for a chart showing the relative size of some of these particles.


1 Inches to Microns = 25400

So how does this relate to my air cleaner?

Be wary of claims of HEPA-Type or other “industry” terms.  Unless the filter adheres to the 99.97% and 0.3 micron guidelines, it is not considered True-HEPA and does not remove particles from the air as effectively.  Quite often, not only will these filters be claim approximately 95% removal rate, but will only be able to make that claim for particles 2 microns in diameter or greater.  That may not seem like much, but keep in mind that a particle with a diameter of 2 microns is actually over 550% larger than one with a diameter of 0.3 microns.  This means that your air cleaner may not be trapping particles that are of a particular concern to you.