The Inside Scoop - indoor air pollution - Brief Article
E: The Environmental Magazine, Nov, 2000 by Kathleen O'Neil

Having Trouble Breathing?
The Problem Could Be Indoor Air

"... Ion generators, available as portable units, also
use electrical charges. They work by charging
particles in a room, but do not collect them. The
particles are then attracted to any nearby
surface--walls, floors, furniture or people. These do
not improve breathing conditions, as the charged
particles are also more attracted to the walls of your
respiratory tract.

A few products intentionally produce ozone, which the
manufacturers say can improve air by breaking down
harmful gases and bacteria. However, ozone is a lung
irritant, and although the concentrations from these
sources may be low, it is best not to intentionally
introduce more into your home. Ozone, a reactive form
of oxygen, can also create more harmful chemicals than
the ones it breaks down.

Many public health organizations, including the
American Lung Association and the California
Department of Health Services, warn consumers not to
use ozone generators because of ozone's harmful health
effects. Electric filters, which may also produce
ozone, need to be monitored, particularly if they were
not installed or maintained correctly."


Another article: (PDF)

New Directions: Ozone-initiated reaction products
indoors may be more harmful than ozone itself.

"I hypothesize that exposure to the products of ozone-
initiated indoor chemistry is more
directly responsible for the health effects observed
in the cited epidemiological studies than is exposure to out-
door ozone itself."

"During periods of elevated outdoor ozone concentra-
tions even moderate air exchange across a building’s
envelope results in sufficient indoor ozone to drive...

...oxidative chemistry

(Weschler, 2000, Indoor Air 10,
269–288). Typically 5–10% of airborne organic com-
pounds contain unsaturated carbon–carbon bonds
(Brown et al., 1994, Indoor Air 4, 123–134) and many
of these compounds react with ozone at rates fast
enough to compete with air exchange rates. The
percentage of unsaturated species is significantly in-
creased by the use of cleaners and air fresheners
containing terpenoids (Nazaroff and Weschler, 2004,
Atmospheric Environment 38, 2841–2865). For each
molecule of ozone consumed, roughly a molecule of the
hydroxyl radical is produced (Atkinson and Arey, 2003"



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