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ODORS GASES SMELLS, DIAGNOSIS & CURE
AIR CLEANER PURIFIER TYPES
AIR POLLUTANTS, COMMON INDOOR
AIR QUALITY IMPROVEMENT STRATEGIES
ANIMAL or URINE ODOR SOURCE DETECTION
BACKDRAFTING HEATING EQUIPMENT
BOOK MOLD, Moldy Book Cleaning
CAR MOLD CONTAMINATION
CARPETING & INDOOR AIR QUALITY
CAT DANDER in buildings
CHINESE DRYWALL HAZARDS
CHEMICAL CONTAMINANTS in WATER
CHEMICAL ODOR SOURCES
CHLORINE IN DRINKING WATER
COMBUSTION GASES & PARTICLE HAZARDS
DIRT FLOOR MOLD CONTAMINATION
DUCT SYSTEM & DUCT DEFECTS
EMERGENCY RESPONSE, IAQ, GAS, MOLD
Fireplaces & Woodstove Contaminants
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
GASES, EXPOSURE, TESTING
GAS DETECTION INSTRUMENTS
GAS EXPOSURE LIMITS & STANDARDS
GLUES ADHESIVES, EXTERIOR CONSTRUCTION
HEATING OIL EXPOSURE HAZARDS, LIMITS
INDOOR AIR HAZARDS TABLE
INDOOR AIR QUALITY & HOUSE TIGHTNESS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
LIGHT, GUIDE to FORENSIC USE
GAS LP & NATURAL GAS SAFETY HAZARDS
METHANE GAS SOURCES
MILDEW in BUILDINGS ?
MOISTURE CONTROL in BUILDINGS
MOLD ACTION GUIDE - WHAT TO DO ABOUT MOLD
MOLD or INDOOR AIR EMERGENCY RESPONSE
MOLD TEST KITS
MOTHS, MOTHBALL ODORS
MSDS Material Safety Data Sheets
MVOCs & MOLDY MUSTY ODORS
ODORS GASES SMELLS, DIAGNOSIS & CURE
OIL, HEATING, EXPOSURE HAZARDS, LIMITS
OIL HEAT ODORS & NOISES
OIL TANK LEAK & ODOR CAUSES
OIL ODOR SOURCES
OUTHOUSES & LATRINES
OZONE for MOLD OR ODORS
PAINTS & COATINGS ODORS IN BUILDINGS
PESTICIDE EXPOSURE HAZARDS
PET ALLERGENS / PET DANDER
PET STAINS & MARKS in BUILDINGS
PET STAINS on WALLS
PLASTIC ODORS-SCREENS, SIDING
PLUMBING SYSTEM ODORS
SEPTIC SYSTEM ODORS
SEPTIC TREATMENTS & CHEMICALS
SEWAGE BACKUP, WHAT TO DO
SEWER GAS ODORS
SMELL PATCH TEST to Track Down Odors
STAINS on & in BUILDINGS, CAUSES & CURES
STAINS on CONCRETE
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAIN DIAGNOSIS on BUILDING INTERIORS
SULPHUR & SEWER GAS SMELL SOURCES
THERMAL IMAGING, THERMOGRAPHY
THERMAL IMAGING MOLD SCANS
TRAPPED MOLD BETWEEN WOOD SURFACES
UREA FORMALDEHYDE FOAM INSULATION, UFFI
URETHANE FOAM Deterioration, Outgassing
UV LIGHT BLACK LIGHT USES
VENTILATION in BUILDINGS
VINYL CHLORIDE HEALTH INFO
VINYL Siding or Window PLASTIC ODORS
VOCs VOLATILE ORGANIC COMPOUNDS
WATER ODORS, CAUSE CURE
WATER TEST CHOICES & WATER TEST FEES
WATER TREATMENT EQUIPMENT CHOICES
Ozone air treatment warnings: this article provides government and other authoritative warnings about using ozone generators and ozone air purifiers in buildings to "purify" indoor air or to "kill mold" in buildings. We give a definition of ozone or O3, we explain what problems can arise when using ozone generators to try to get rid of odors indoors or to try to kill mold.
We explain the problem of oxidation of building materials from excessive ozone exposure and the horrible chemical smells that may follow such mistakes. We describe how to track down which building materials were over-dosed with ozone and are now giving off a new stink, and we explain how to cure that problem. (Note: other uses of ozone as a disinfectant can be effective and are important in many applications.)
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While there are many sound and important uses of ozone (such as for medical disinfection under controlled conditions), in general this is an idea which ranges from bad to dangerous in the home. Ozone is widely promoted by ozone generating equipment companies and cleaning services for use in indoor building environments to deodorize, disinfect, "kill" mold, and for "general health".
Ozone generators are also promoted for use to reduce the level of airborne particles, pollen, animal dander, and allergens, ostensibly to improve indoor air quality for asthmatics and people with allergies.
Ozone or O3, or "trioxygen" is a molecule made of three oxygen atoms. In this form, and referred to as an "allotrope" of oxygen, ozone is an unstable gas - that means it breaks down into oxygen molecules.
A separate question remains, in some cases, of whether or not building occupants have been exposed or are being exposed to harmful ozone levels. See OZONE AIR PURIFIER WARNINGS and see OZONE MSDS and OZONE TOXICITY.
But nevertheless, ozone is a highly toxic gas. Now even highly toxic substances can be encountered safely. The main concern with ozone exposure is that the ozone concentrations to which people are exposed
Exposure to a level you can smell or exposure to ozone over long periods at levels greater than 0.05 ppm for 24 hours at a time is likely to be dangerous: ,  Health hazards to humans and animals occur and can be severe at ozone levels used for indoor cleaning purposes.
At least some people can smell levels of ozone down to 0.05 ppm. This odor-detection level is already half-way to the recommended limit. If you are generating ozone indoors, even at "low" levels a problem may be present. People become desensitized to odors in a short time, perhaps 20 minutes. So if you do not smell it, the ozone level could still be hazardous. Problems include:
Use of ozone to "remove" or "kill" mold is ineffective, not recommended, and may be dangerous. Even if ozone were applied at a concentration and for a duration sufficient to "kill" every mold spore in a building (which is a very dubious claim), depending on the mold genera/species present there is a good chance that the process leaves toxic and allergenic particles in the building.
Ozone Toxicity: How toxic is ozone, general background, levels of ozone gas toxicity, ozone gas applications
The following information about Ozone is quoted from "Health Hazards of Some Gases" 
"Ozone is a kind (called an "allotrope") of oxygen . It is formed in the ionosphere by the action of ultraviolet radiation from sunlight on oxygen. Lightning strokes are another natural source of ozone and the characteristic odor of that material can often be noted during and after a thunderstorm.
When pollutants are emitted into the air either by man or nature, almost all are eventually removed by one or more of several processes including reaction under the influence of ultraviolet radiation. One series of such reactions results in the formation of ozone as a "secondary" (formed by reaction in the air) air pollutant, often in rather high concentrations (several tenths of a part per million).
"As ozone can be formed by nature's sparks (lightning), it can also be formed by man's. Whenever an electrical spark or corona occurs in air, some ozone is formed. This accounts for the characteristic odor noted near an operating electric motor such as an electric shaver.
"Because ozone is found in so many places, its toxicity (ability to injure a living organism by other than mechanical means) has been investigated extensively since the early 1900s. Experimentation has shown that the odor of ozone can be detected and identified by most people at a concentration of from 0.02 to 0.05 ppm (parts ozone per million parts air + ozone). As the concentration increases to a few tenths of a part per million, the first effect noted is likely to be a feeling of dryness in the back of the throat. If a concentration on the order of 0.2 or 0.3 ppm is inhaled more or less continuously for several hours to a few days some lung irritation may result.
"Higher concentrations can produce several kinds of toxic effects if exposures are sufficiently prolonged. Eye irritation (despite newspaper and TV accounts seemingly indicating otherwise) occurs only at concentrations high enough to result in other, more severe, toxic effects.
"Ozone is a very reactive substance. It will readily react with just about any material capable of being oxidized, and with many that are not. The material with which it reacts may be a gas or vapor, a particle floating in the air (a mold spore, for example), or a solid (or liquid) surface. For this reason, when ozone is present in most enclosed spaces its concentration declines quite rapidly with time. Of course, if ozone is being generated more rapidly than it is destroyed by reaction, its concentration can build up. This is the main reason why devices that produce relatively large amounts of ozone are safe only in relatively large enclosures and why the ozone generation rate should be reduced in small enclosures.
"Ozone is well known for its ability to eliminate certain odors. How this is accomplished is controversial. At concentrations just above the odor threshold, some odors do seem to vanish. The main reason for this may be ozone's ability to desensitize the olfactory apparatus so that the odors can no longer be perceived. Some evidence indicates that this may be the case at least occasionally. Other evidence indicates that ozone may react with the odor-causing substances, eliminating them from the air (this is probably the only mechanism that operates when concentrations are below the odor threshold).
"Finally, some people have insisted that even if ozone does not paralyze the olfactory sense, its odor is such that it "masks" other odors. Perhaps all three mechanisms operate, each in its own area of effectiveness.
"As with all other materials, ozone has a dose-effect relationship with a threshold. That is, once the threshold dose has been exceeded, toxic effects are proportional to dose. For inhaled gases, dose is proportional to both time and concentration. If the duration of exposures cannot be controlled (as is usually the case), then the concentration must be kept low enough so that no injury will occur even from prolonged and repeated exposures. For ozone, that "threshold" concentration is 0.1 ppm.
So long as concentrations are kept at or below that level, injury is not expected even in the most sensitive workers so long as their exposure durations coincide reasonably well with or are less than the 8 hr/day, 40 hr/wk regimen. This "threshold" level is accepted by the American Conference of Governmental Industrial Hygienists (and is called the Threshold Limit Value by that organization) and by the Occupational Safety and Health Administration, OSHA.
The TLV or OSHA's Permissible Exposure Level (PEL) is not a fine line between safe and non-safe. Instead, it represents the best judgment of a group of experts of the highest concentration that can be inhaled repeatedly by a population of workers with no resulting injury. Higher concentrations may or may not have any particular effect on a specific individual.
"Ozone is a highly toxic gas but even highly toxic substances can be encountered safely. The main concern with this material is that concentrations to which people are exposed do not average more than 0.1 ppm over an 8-hr day, and do not exceed that value by more than a factor of 2 or 3 during the exposure."
A second class of problems when ozone is misapplied indoors is the creation of lingering odors due to the oxidation effects of the highly reactive ozone gas while it was present.
In our OPINION, following ozone use as a "deodorant" if there is no lingering odor from oxidized materials in the enclosed space (a building, car, boat, RV, etc), and considering that ozone itself is so volatile that it does not hang around in the building, then its application probably did not create a problem for the building.
Ozone is never recommended as a "mold killer" since that strategy is fundamentally flawed in the first place. Details are at MOLD KILLING GUIDE.
Ozone Oxidation Problems: Second-Cause Odors in Buildings Following use of an Ozone generator
At OZONE AIR PURIFIER WARNINGS we include an example report of horrible building odors that were caused by attempts to get rid of an indoor odor using an ozone generator. when high levels of ozone have been produced in an enclosed space, we find that other materials in the space become partly oxidized, subsequently giving off horrible, often chemical-like odors. We have traced odors to painted surfaces, furniture, upholstery, curtains, carpeting, carpet padding, and other materials.
Here are some examples of material we've found giving off horrible smells after misuse of an ozone generator. (Misuse means using the ozone generator to try to kill mold, or running an ozone generator too long at too high a setting in too small a space - overdoing it).
Using Ozone Left a Smell in our Home - How do I Get Rid of It? - Using Ozone Indoors to Cure Skunk Smells, Mold Odors, and other Stinks
This quote from a reader's email pretty well sums up what happens if you overdo it when using an ozone generator indoors to try to "kill off" odors:
We have investigated a number of cases of misapplication of ozone generating machines both to "kill mold" (no good, you're leaving toxic or allergenic particles, and you haven't corrected the reason for mold growth in the first place). We have also investigated several cases of excessive ozone-use to try to remove odors from buildings, including fire or fireplace smells, mold smells, pet or animal smells, skunk odors, smoking odors, etc.
Here is another similar case:
Reader Question: We also have had a very bad experience with use of Ozone generators.
5/18/2014 sandy said:
We also have had a very bad experience with use of Ozone generators. We purchased a new condo last May and from the time we did our walk thru we noticed a faint odor as we entered. The builder blew it off as construction odors. After two months we shipped clothing to our second home and noticed a musty smell on everything. We then noticed that our luggage and other personal belongings had also picked up an odor. We hired a company to do mold testing and they found no elevated mold spores. The builder hired a remediation company to investigate the source of the odor.
They did thermal imaging, checked air handlers and checked all plumbing and could not determine the source so they tried to get rid of the odor by putting two ozone generators in our home for 4 days! This altered the odor and significantly increased it. Air testing after this showed high levels of VOCS in the house which we think was caused by the ozone oxidizing all the new carpet and furnishings in the home.
As recommended by and industrial hygienist we removed the carpet and all furnishings and tried 6 air purifiers with charcoal filters being changed every two days for a week and two weeks of a flush out process and the odor still remained. We determined that the odor had permeated into the drywall so we have just had all the drywall sealed with a special primer and two coats of paint applied and we're hoping that this is the final solution after 6 months of dealing with this mess.
My husband has been bothered with severe eye irritations which we also believe is the result of this ozone treatment. We now have to determine how much of our furniture can be salvaged. We've been told that it will continue to off gas. Do you think this is possible and do you have any suggestions for eliminating any remaining odors from mattresses, upholstered and leather pieces. This is all new furniture valued at about $40,000.
Reply: stunning incompetence in mold remediation
Regrettably the procedure you describe as used by your remediation company is packed with improper and ineffective methods, providing a compelling example of in my opinion incompetence that wasted everyone's time and your money. These include:
The solution at this point is
To track down the source of post-ozone-treatment smells, try making a smell-patch test to determine just which building component has been oxidized. Following this procedure we can often narrow down the source of post-ozone-treatment smells to a single material that can then be removed or remedied, such as carpet padding or a specific piece of furniture.
A complete guide to tracking down odors in buildings is at ODORS, Smells, Gases in Buildings-Diagnosis & Cure.The smell patch test procedure and its use to track down building odors caused by over-dosing with ozone is described here.
Before Using Ozone or Gutting a Building to Get Rid of Odors, Try the Smell Capture Patch Test to Pin Down a Specific Indoor Odor Source
Our friend and fellow forensic investigator Jeffrey May suggested a smell or odor source track-down procedure for pinning down a specific odor test in buildings - it has worked remarkably well for us where ozone had caused an indoor smell that could not be tracked down as well as for general odor emitting source identification.
The odor source pinpointing procedure uses simple materials readily available: paper towels, masking tape, aluminum foil, and a person with a good sense of smell.
However, essential for success are the steps and their sequence, and the choice of who is going to do the sniffing, as we describe in detail in our adaptation and illustrations of Jeff's idea, now found at SMELL PATCH TEST to Track Down Odors.
We have had very good results with this procedure when used to narrow down odor sources in an ozone-treated building, and in a field study we obtained roughly 95% odor source identification reliability when we used additional smell test patches.
How to Use the Smell Patch Test to Track Down Ozone-Oxidation Problems
Look First at These Prime Suspects for Ozone Oxidation
If you have aired out the building and days or more have passed and you still smell a "new" chemical or plastic or other odor that was not there before you tried using your ozone generator, you'll need to determine just what materials were oxidized by the high levels of ozone in the building.
It's been our experience that once you identify and dispose of the new-smelly material you'll probably be fine.
However, by nose alone, it is very difficult to track down a specific indoor material to the odor source in this case. Jeff May suggested[1b], and I've more extensively explained and documented an inexpensive means to track down odor sources to indoor materials or furnishings: see SMELL PATCH TEST to Track Down Odors for details.
The procedure works best if you have as the "smeller" a person with a good sensitive ability to discriminate among odors. The smeller can briefly go indoors to become familiar with the odor whose source you are seeking. But they then have to stay outdoors breathing clear air long enough to regain their original smell sensitivity. (When we are exposed to an odor for some time, our brain starts to tune it out.)
So typically you bring in the smeller, let her sniff and agree that she will recall the objectionable odor, then give her a few days off while you prepare the test we describe above. You use the foil, tape, and paper towel procedure I describe at the link above.
Watch out: People become desensitized to odors in a short time, perhaps 20 minutes. So if you do not smell it, the ozone level could still be hazardous.
Reader Question: We left the ozone machine running and are now left with a strong chemical smell
(May 6, 2014) L.K. said:
We purchased second hand furniture for my sons room that smelled like smoke. A friend gave us an ozone generator to eliminate the smell. Unfortunately, we did not know much about ozone. We left it running on high in his room for many hours and now are left with a strong chemical smell. Upon doing research, we now realize that ozone is unsafe and have sealed off the room and had windows open and fan running for a week. However, the smell still lingers and gives us a headache to even walk into the room.
I am concerned for my 8 year old son to move back into that room and he is concerned for all his belongings! We have small children as well as a newborn. How do we keep them all safe once this toxic gas is already in the house? How do we eliminate it? No one seems to know much about ozone or how to get rid of it once it is present. Please help! We are very concerned. - L.K. [reader anonymity protected]
Sorry to read you're another victim of over-dosing a room with ozone.
The ozone itself is very volatile and will be long gone if you turned off the equipment and aired out the room.
The smell that remains is probably from oxidized materials, possibly carpeting, padding, foam cushions or something else. That outgassing odor tends to continue for a long time. The solution is usually to identify exactly what is giving off the odor and dispose of it.
See our smell patch test procedure at SMELL PATCH TEST to Track Down Odors
for an inexpensive and easy way to track down the offending material.
Keep us posted.
Thank you so much for your response! We had contacted home inspectors, EMT, Poison Control, doctors etc and no one knew anything about ozone! I am glad we found someone who is knowledgeable in the area, as I have been very concerned.
Here are the circumstances of our situation.
The ozone generator was left on high in a small bedroom for aprox 6 hours. The door was sealed, the AC vent closed, the window opened and ceiling fan on. Upon turning off the machine, there was a terrible smell and we had to run out of the room. We got headaches instantly. We then left the ceiling fan on, door sealed, windows opened and box fan blowing out the window, for a week.
However, the room still has a sweet – like, artificial smell to it. There is no carpet in the room. Just a bed, dresser, closet full of spare pillows and blankets, and lots of stuffed animals and toys. The clothing that I retrieved from the room continue to have the same artificially sweet smell even after washing them several times. I got a headache once again from just entering for a moment even after a week of airing out, and every morning I now wake up with a sore throat.
We have small children including a newborn and I worry for their health. I keep all the bedroom windows cracked open every night.
The website was very helpful. However, after reading I am a bit confused. I have several questions.
You mentioned in your response that the ozone would be gone by now.
· Is that “sweet” smell the smell of ozone?
· If the ozone doesn’t stay around, why do I still smell it? And why do I still get a headache?
· Are the dangers of exposure only referring to the actual time when the generator is on, or are there dangers in the lingering smells from the ozone machine? Is that smell toxic as well? Why did people say they had to throw out all their belongings or leave their home, if there was no danger once the machine is off?
· How do I know the ozone level in that room? Is there a way to measure it? Is there a machine/purifier to take ozone out of the air or a way to detox the room and belongings?
· Do I need to throw out everything in the room if it continues to have this smell? Is it safe for my son to sleep in there? Safe for infant to be exposed to?
· What department does this topic fall under and why doesn’t anyone else seem to know anything about it?!
My intention suggesting the smell patch test was to try and focus on what is the source of the horrible odors ensuing from overdosing with ozone - the oxidized materials. If you can relate one or more of your smell patch tests to the odor that was bothering you in the first place you know what needs to be tossed out (as oxidized materials usually won't be much deodorized by washing or dry cleaning).
Other odor sources can usually be cleaned successfully, or cleaned then sealed.
Is the odor caused by oxidized materials toxic as well?
At this point, the smell left behind in the pillows, blankets and clothing don't seem to bother anyone (or be noticeable to anyone) but me. So I am wondering if it would be harmful to keep my sons clothing etc once I've washed them several times and the smell is very faint - L.K.
Possibly, the odors you smell are harmful in any of a variety of ways: respiratory irritant, or even toxic. One can't say what's toxic or not with not any idea of what was oxidized.
L.K. as people vary in their sensitivity to odors and chemicals and as we're talking vague generalities here "clothing" and "faint smells" niether I nor anyone can by e-texting reliably assess risks to your family.
I would agree that if you are confident that a noxious odor remains and that you can't get rid of it by laundering or cleaning, and if by comparison with other non-ozone-exposed items made of the same material you can confirm that the odor of the offending items truly is due to the ozone treatment, then your choices are to tolerate the odor or dispose of those items.
General Use of Ozone Generators nor Ozone Shock Treatments as a "Cure" for Building Mold or Odors is Not Recommended
Watch out: Ozone is a highly toxic, oxidizing gas. It can be absorbed into the body via inhalation, skin or the eyes. It can also oxidize building materials. See the Ozone hazard and use warning articles listed at the end of this article.
Watch out: In-Home or "portable" ozone generators and industrial or "shock treatment" ozone generators not only fail to find and remove the source of mold or building odors, in addition ozone concentrations generated by ionic air purifiers can exceed (industrial) levels permitted by U.S. Environmental Protection Agency. This problem is more severe when
In addition, a ban of in-home ozone producing air purifiers was announced by the California Air Resources Board in September 2007. This law requires testing and certification of all types of air purifiers to verify that they do not generate excessive ozone. See "Health Hazards of Ozone-generating Air Cleaning Devices", State of California-Health and Welfare Agency, Department of Health Services, Indoor Air Quality Section
Green link shows where you are in this article series.
Frequently Asked Questions (FAQs) about Ozone Use Indoors as an Odor Killer or Mold Killer
Question: how do I get rid of high ozone concentrations produced by a spark generator
How do you rid a room of highly concentrated ozone produced by a spark generator?? 400sq ft, various items of wood furniture, paneling, bed with foam mattress, etc?? - Charles 12/2/11
Reply: if you smell ozone it's probably unsafe; if you smell something else later it may be due to an ozone treatment "overdose"
Charles, in the article above we make suggestions for getting rid of ozone smells indoors. If you are inside of an enclosed space while ozone is being generated at levels that you can smell, it is unsafe.
And ozone is ozone. It doesn't matter how it's produced: by spark generator or any other means, the molecules are the same. What does vary among ozone treatments and the people who use them, are
Actually unless you are smelling ozine while you are in an enclosed space while ozone is being generated (something that is most likely unsafe), you are not smelling ozone - it's very volatile and doesn't hang around. So the ozone itself, and its characteristic odor, will dissipate rapidly, minutes to hours, of fresh air ventilating of the space where ozone was produced.
Most complaints we receive are from lingering odors after an ozone overdose of an indoor area in an attempt to remove smells.
An "ozone treatment overdose" is my general term for applying ozone at levels or at a duration long enough to cause chemical changes, probably oxidation, of other indoor materials (carpets, curtains, foam cushions, plastics) that in turn leaves a lingering, obnoxious odor that just doesn't go away satisfactorily. Please review the article above and you'll see an outline of how we suggest you proceed.
Question: I have asthma and was exposed to ozone in an enclosed space for a few minutes.Will that cause health problems?
I have asthma and was in a closed room with the ozone machine working for a few minutes, would that cause me health problems in the future? - Sandy 10/26/11
Reply: a brief exposure to low levels of ozone should not cause lasting health problems for most people, but some are at extra risk
No one give a "for sure answer" to your question about ozone exposure based on a text note; your doctor would have to do that based on an examination.
At 3 Steps to Assessing Possible Harm from Exposure to Ozone Gas O3 we summarize a reasonable approach to assessing possible complaints ascribed to ozone exposure, starting with a consult with your doctor and we describe the TLV point for ozone below which no expert expects there to be an injury or ozone-related complaint (given certain exposure duration assumptions).
At OZONE TOXICITY we report that
As with any potentially harmful or irritating substance exposure, the risk is a function of several variables including
This means that even a brief exposure to very high levels of ozone could injure someone. Of course now, after the fact, you will most likely have no idea of what the actual level of your ozone exposure was.
But in general, a brief exposure to a closed room "for a few minutes" is very very unlikely to produce a measurable future health problem provided
Ultimately this is a question you need to discuss with your doctor or with a pulmonologist who knows your medical history.
Question: Spark generated ozone is not the same as UV generated ozone and my ozone is safe
This article represents spark generated Ozone. Long doses of this method can be detrimental with nitros oxide. UV generated ozone in high levels "DOES NOT" cause collateral damage and it would have to be left at super high levels for a over a week to have an affect on carpet or building materials. In ranges near 150PPM it is 100% effective on killing mold with exposure times over 6 hours and 99.996% of all bacteria. When the treatment is over the ozone converts back to oxygen 'O2' and the clean smell is gone within 2 days. I have independent test results to prove it and detailed personal and business experience using it. Most articles I have read have been by mold remediation contractors that would take a major blow to their profits because they would not be able to rent their equipment to insurance companies. If a building is wet of course it needs to be dried and sheetrock removed. There is no need however to tear a house apart because there is mold present on dry sheetrock. I challenge anyone to a significant 'bet' that can prove otherwise. Brent - 9/29/11
Thanks for your comment, Brent. We note that you appear to disagree with the U.S. EPA as well as the fundamentals of chemistry, science, and other authoritative sources cited above and below as well as with our own extensive field experience with severe odors and damaged building materials following over-use of ozone as a cure all for building smells or mold.
Brent, there is almost nothing correct in what you say in claiming that how ozone is generated affects the potential toxicity or volatility of the ozone molecules.
Ozone is O3 , a molecule that is identical regardless of how it was generated. At this point with so many years of expert research on this topic, there isn't much room for arm-waving challenges, bets, and assertions.
We agree that ozone is highly volatile and does not stay around in buildings. We also agree that ozone, precisely because of that extra oxygen molecule, is highly volatile and can oxidize other molecules. It is precisely that volatility that can result in overdosing a building or car or other enclosed space and its contents, apparently oxidizing materials and causing related problems.
And please compare your 150PPM concentration of ozone with the recommended industry standards, limits, exposure limits, etc. See OZONE EXPOSURE STANDARDS where you will see that your recommended dosage levels are enormously higher than any recommended human exposure.
DCW: in the most elementary chemistry class one learns that an ozone molecule is identical regardless of how it is generated. What may vary is the ozone level reached in an enclosed space, and the duration of exposure of the space to that gas.
Question: who says Ozone can be dangerous?
I think these claims about the hazards of ozone are made-up. Tim / 2011
Tim: please read again with more care, including the US EPA and other citations at the end of this and each Ozone-related article at this website.
This article includes fourteen citations regarding ozone hazards. And above in the FAQs we refer readers to OSHA and other sources who set standards for allowable ozone exposure. Those articles contain hundreds of additional source citations.
Questions & answers or comments about government & other expert warnings concerning the use of ozone generators indoors as air purifiers or for mold remediation.
Check the FAQs just above, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
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