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RE: Germ-Free Humidifiers-Ozone Production
Olfactory detection of ozone odor has been reported at between 0.002 to 0.1
ppmv. Ability to smell ozone differs among individuals, and the ability of
an individual to smell ozone may change from day to day. However, most
people can initially smell ozone at around 0.015 ppmv. Since olfactory
fatigue developed readily, the odor of ozone is not a reliable index of its
concentrations. The 0.05 ppmv is the FDA's ceiling limit on ozone
concentration in occupied spaces generated by a medical device. This limit
is applicable to ozone accumulation in air due to the operation of the
device or in a volume of air circulated through the device.
Al-Ahmady, K.K. (1997). Indoor Ozone. Florida Journal of Environmental
Health, 158:8-12.
Boeniger, M.F. (1995). Use of ozone generating devices to improve indoor
air quality. American Industrial Hygiene Association Journal, 56:590-598.
_________________________________________________________________________
Kaiss K. Al-Ahmady, Ph.D., P.E.
Indoor Air Solutions, Inc.
8222 Island Breeze Ln.
Tampa, FL 33637
Tel: (813) 558-0404
Fax: (813) 558-0244
e-mail: kaiss.alahmady@gte.net
-----Original Message-----
From: Levin, Robert [SMTP:robert.levin@sylvania.com]
Sent: Thursday, November 18, 1999 3:42 PM
To: Multiple recipients of list
Subject: RE: Germ-Free Humidifiers-Ozone Production
Germicidal lamps are low pressure mercury discharge lamps. They are
essentially fluorescent lamps without phosphor and in bulbs that transmit
the 253.7 nm mercury line. Most are "ozone-free" in that the bulb
transmittance cuts off above the ozone producing 184.9 nm mercury line.
Such bulbs are made using UV transmitting glass or certain types of quartz.
Some special germicidal lamps have a bulb made with a type of quartz that
will transmit below 200 nm, and these lamps are identified as ozone
generating lamps.
Robert E. Levin, Ph.D.
Corporate Scientist
OSRAM SYLVANIA
71 Cherry Hill Drive
Beverly, MA 01915
phone: (978) 750-1594
fax: (978) 750-1794
e-mail: robert.levin@sylvania.com
> -----Original Message-----
> From: Richard C. Mannix [SMTP:rcmannix@uci.edu]
> Sent: Thursday, November 18, 1999 3:02 PM
> To: Multiple recipients of list
> Subject: Germ-Free Humidifiers-Ozone Production
>
> <snip>
> Also, does anybody know a reference for the odor threshold of ozone? I
> believe that it is about 0.05 ppm, but I need a citable reference.
>
> Thanks.
>
> Rick Mannix
> Health Physicist
> Laser Safety Officer
> Univ. of California
> 300 University Tower
> Irvine, CA 92697-2725
>
> 949-824-6098
>
> rcmannix@uci.edu
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information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html