Purifiers
My daughter has asthma. Would she benefit
from an ozone air purifier in her room?
Answers
from James T C Li, M.D., Ph.D.
Despite manufacturers' claims, ozone air
purifiers don't remove asthma triggers from the air.
In fact, inhaled ozone can make asthma worse.
Ozone generators sold as air purifiers
intentionally produce the gas ozone.
Ozone can mask odors by changing the chemical
composition of particles or other gases in the air, making the air seem fresher
and cleaner.
However, ozone generators do not actually filter
out the small particles that trigger asthma.
Inhaling ozone, even in small amounts, can
irritate the lungs.
Specific effects may include throat irritation,
coughing, chest pain and shortness of breath, as well as an increased risk of
respiratory infections.
Some ozone air purifiers are made with an ion
generator, sometimes called an ionizer, in the same unit.
You can also buy ionizers as separate units.
Ionizers do remove particles from the air,
causing them to attach to nearby surfaces or to each other and settle out of
the air — but they may generate unwanted ozone.
Air filters that remove small particles — such
as high-efficiency particulate air (HEPA) filters — are effective in removing
allergens from the air, without posing any ozone concerns.
To work effectively, filters need to be cleaned
or replaced regularly, according to the manufacturer's instructions.
What Ozone Is and Why It Is Dangerous
Most
people, even if they do not know what ozone is, have heard of it, usually in
context of the ozone layer in the atmosphere that protects the earth from
ultraviolet light.
However,
ozone is not so benevolent a substance when we come into close contact with it.
As
the Environmental Protection Agency says: "Good
Up High, Bad Nearby."
Ozone
is a molecule consisting of three oxygen atoms, rather than the two that
comprise a "normal" oxygen molecule.
The
third atom can relatively easily become detached from the other two, and once
free, it will interact with other substances.
One
of these "other substances" is your body.
Even
small amounts of ozone, according to the EPA, "can cause chest pain,
coughing, shortness of breath, and throat irritation," as well as even worse
effects.
Those
with asthma may find their conditioned worsened by exposure to ozone, and ozone
also reduces the body's ability to combat respiratory infections.
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