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A
third category sometimes mentioned is odors, though in truth,
when we smell something what we are doing is inhaling a
gas; thus odors are caused by chemicals and are removed
the same way.
Airborne
Particles
These come in a variety of shapes and forms from many sources,
and encompass dust, pollens, mold, hair, pet dander, bacteria
and viruses.
Chemicals/Gases
Gases constantly surround us and are essential to life on
Earth. Our air is a mixture of gases including oxygen which
we must breathe to live. However, there are gases that can
be dangerous, even lethal to breathe, and these are the
gases that an air purifier can be used to negate. Gases
come from many man-made sources, both industrial and residential.
Some common examples include formaldehyde in new carpeting
and the many chemicals in cleaning products. Some gases
that exist naturally can also pose serious health risks,
such as radon gas. Gases are also the source of odor.
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