United States
                     Environmental Protection
                     Agency
                     Research and Development
 Air and Energy Engineering
 Research Laboratory
 Research Triangle Park, NC 27711
 EPA/600/SR-93/177   November 1993

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leakage around the door and through the
walls.  In running  these tests,  the  chief
interest was in the amount of ozone being
contributed to room air and not the ozone
levels at the face of the instrument. How-
ever, these were also measured.
Conclusions
  When operated at the recommended
setting for  normal use  (dial  set at 11
o'clock), the ozone generator contributes
little or no ozone to background air levels.
At the highest setting, however, it can
contribute as much as 100 ppb to a well-
ventilated room and 10 times that much to
a poorly ventilated one. Our personal ex-
perience shows that at that level the air
becomes difficult to breathe and there is
some irritation of the eyes and  the mu-
cous membranes, perhaps due to exces-
sive drying.
 The EPA author, Raymond S. Steiber, is also the EPA Project Officer (see below).
 The complete report, entitled "Contribution to Indoor Ozone Levels of an Ozone
  Generator," Order No. PB93-234 557/AS; Cost: $17.50, subject to change) will
  be available only from:
        National Technical Information Service
        5285 Port Royal Road
        Springfield,  VA 22161
        Telephone: 703-487-4650
 The EPA Project Officer can be contacted at:
        Air and Energy Engineering Research Laboratory
        U.S. Environmental Protection Agency
        Research Triangle Park, NC 27711
                                                                                    •U.S. Government Printing Office: 1993 — 550-067/80120
United States
Environmental Protection Agency
Center for Environmental Research Information
Cincinnati, OH 45268

Official Business
Penalty for Private Use
$300
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                                                           EPA
                                                     PERMIT No. G-35
EPA/600/SR-93/177

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