How Does Ozone Kill Mold? All Questions Answered!

Helen Skeates
Helen Skeates
29 min read

Mold infestations can be dealt with more effectively if you know how ozone kills mold. Mold spores and cells are killed by ozone’s interaction with the gas.

The chemical structure of the mold is altered as a result of this interaction, rendering it inactive or dead. The fact that ozone destroys mold is not enough.

Is ozone safe and useful for treating mold? Learn all there is to know about mold and ozone by reading on.

As a result of the mold development in your home, your walls have become discolored, your home has acquired a musty odor, and in some cases, the health problems of individuals who live in the house are exacerbated. For mold to grow, there are numerous issues that must be addressed in a way that is both safe and effective, but the most difficult part is dealing with the mold removal procedure itself.

Mold remediation specialists, who have received specialized training in the mold removal procedure, are the most commonly used approach for eradicating and mitigating mold growth in your interior environment in your house. These mold remediation professionals will try to eliminate any mold that has grown on your home’s surfaces. In addition, you will need a highly-effective mold air purifier in your home to deal with the mold spores floating around in the air.

Here, we’ll talk about the dangers that mold and its spores offer to your home, as well as the finest air purifiers to use in your house to help keep mold spores contained and killed from the air.

What is Mold in House?

As soon as you hear the term “mold,” your thoughts and fears will begin to go through your mind about the potential threats this fungus might bring to your indoor environment. The optimum conditions for the rapid growth of this potentially hazardous fungus can be found in almost any home environment. There are over hundreds of thousands of mold species in existence today, many of which are still unnamed, and the effects they can have on the environment can vary depending on the mold type found in your home.

Ozone treatment in the fight against the coronavirus |

Mold growth in a home usually begins with water incursions or leaks, which create an excellent habitat for mold growth. If you combine this moisture with warm weather and a lack of light, mold will proliferate quickly. As the mold spreads throughout the house, it can undermine the structure of the walls, ceilings, and floors, eventually destroying them since it feeds on the materials they are made of. A mold infestation can also produce spores that are released into the air and land on surfaces throughout the house, where they can propagate other mold infestations. These mold spores, on the other hand, are potentially harmful to human health, since they can enter the body by inhalation or ingestion, making their way into the deepest recesses of the lungs and possibly triggering serious health repercussions in some persons.

Types of Household Mold

Mold is found in every single home, according to a 2003 University of Arizona research. Some molds like stachybotrys chartarum are toxic and wreak havoc in a home, and most importantly on the occupants exposed to this form of mold. Despite the fact that this study does not categorize the types of molds present in homes, there are numerous classifications of mold that are not hazardous. As a mold species grows in an indoor environment, its characteristics, growth patterns, and effects on human health will all vary. This variation helps in the identification process of different types of household mold. When it comes to the most common molds found in homes, the following are the most frequently seen and observed.

  1. Alternaria is a velvet-textured, dark green or brown mold that is frequently recognized as an allergy. It is common to find this mold growing around showers, bathtubs, and even under dripping sinks.
  2. In the home, Aspergillus is a mold that can grow in thick, flask-shaped layers on the walls. Depending on the species of mold and the habitat in which it grows, this allergic mold can be more dangerous.
  3. There is a mold known as Cladosporium that is capable of growing in a variety of different environments, including both indoors and outdoors, and can be seen growing on many types of textiles such as carpet and upholstery. This mold has a suede-like appearance and feel, with an olive-green or brown hue.
  4. In water-damaged homes and buildings, penicillin can be identified by its blue or green surface with a velvety feel. In carpets, wall paper, ductwork, and even beds, this sort of mold may quickly spread throughout a building.
  5. Stachybotrys: Does black mold pose a threat to human health? Stachybotrys Chartarum, one of the most dangerous molds known to the general public, is a toxigenic mold that is known to produce allergic reactions in persons who are exposed to this mold. When this mold grows on a surface in an indoor environment, it appears dark greenish or black in color. People that breathe in the mycotoxins released into the air by Stachybotrys can develop serious health problems as a result of their exposure.

How Does Mold Reproduce

Mold spores are released into the air during the growth phase of mold in an environment when it reaches a certain point in the growth process. Mold reproduces by releasing spores into the atmosphere, which are the mold’s reproductive seeds. This raises the risk that mold spores will penetrate a person’s body and enter the lungs and eventually the circulation, which is extremely deadly.

Inhaling mold spores can cause an allergic reaction in most people, as the immune system is usually activated by these spores. When foreign invaders enter the body and cause immune system reactions like allergy symptoms, the immune system is acting as a reactive function in the human body. Allergic symptoms include sneezing, running nose, itchy eyes, and, in rare cases, skin rashes, as documented by the Environmental Protection Agency (EPA).

What is an Ozone Machine

People who live in mold-infested homes risk both their health and the health of others who breathe in the contaminated air. It may be required to use mold mitigation methods to safely and effectively eliminate mold from your house if you’ve discovered that it’s present in considerable or acute amounts. Air purification or air purifier devices are widely used to remove mold spores from the air in your house, removing them from the air you inhale. To combat mold in an interior environment, you may want to look into ozone machines, which may be used in conjunction with other air purifiers.

To combat and remove mold spores from the atmosphere, an ozone generator or machine can be utilized in a variety of interior situations, including those with mold growth. Toxic pollutants can be removed from the air by using these air purifiers outside, however indoor use may result in more danger and hazards than benefits. One of the most reactive and unstable molecules in nature, ozone can be generated by this sort of air purifier and released into the atmosphere.

How Does an Ozone Generator Work

Is ozone generated by an ozone machine? An ozone generator’s functions and operations are distinct from those of other air purifiers. These devices function by releasing ozone gas into the atmosphere, which subsequently attaches to other oxygen molecules in the air to generate ozone molecules (O3). The ozone machine emits O3 molecules into the air, and those molecules oxidize quickly to bond to airborne contaminants. Ozone depletion occurs when the ozone’s third oxygen atom breaks away from the ozone and attaches itself to other chemicals in the air.

Airborne pollutants, including odors and mold/mildew contaminants, can be eliminated when ozone is released into the air by the use of an ozone generator or machine. Ozone gas is produced into the air at high levels, which might cause health reactions and impacts if considerable exposure occurs in the indoor setting.

Are Ozone Generators Safe?

When ozone generators are utilized in an indoor location, such as a house or workplace, there has been a lot of controversy about their safety and health. The ozone that is released from ozone generators are usually produced in high concentrations which can react with the human body adversely. As stated by the Environmental Protection Agency (EPA), ozone generators pose a threat to human health.

Does Ozone Kill Mold and Is It Safe? | Mold Help For You

Will Ozone Kill Mold in the Air

The safety and health of ozone generators, especially when utilized in an indoor environment such as a house or workplace, has been the subject of much discussion. Due to excessive quantities, the human body may respond negatively to ozone generated by ozone generators. There are ozone producers that are harmful to the environment, according to the EPA.

Ozone generator mold removal can be used to eliminate mold in the air, but it can also release potentially harmful gases into the air, which can have negative health impacts on the occupants of a building. Because of the high quantities of ozone in the air, this is not a good option for mold eradication in the air because it might leave the environment much more contaminated.

Alternative Air Purifier for Mold

There are several things to consider before buying an air purifier to remove airborne mold spores from a home that has been contaminated by indoor mold development. In order to get rid of the mold spores filtered via an air purifier, you need to search for one that has UV-C rays that may kill them. Another requirement is a high-efficiency filter that can capture small particulates like mold spores and deposit them in the filter medium. For the final piece of the puzzle, you’ll want to look for an air purifier technology that doesn’t emit or manufacture harmful byproducts or chemicals into the air, which could further deteriorate air quality and human health.

Using a combination of Advanced EnviroKlenz technology, HEPA filtration, and ultraviolet germicidal radiation (UVC), the EnviroKlenz UV Air Purifier eliminates airborne particulates and allergens while also inhibiting the growth of microorganisms such as mold spores, bacteria, and viruses that have been captured. Toxic VOCs produced by mold and its spores can be neutralized by the EnviroKlenz UV Air Purifier’s design, which also includes a hospital-grade HEPA filter for the ability to capture fine particulate matter larger than 0.3 microns in size from the air. This will include those microscopic reproductive spores emitted from mold. On top of the HEPA filter is a pair of UV-C lights that are safe to use, but powerful enough to eradicate mold spores on the collection surface. The EnviroKlenz Air Purifier is therefore a safe and effective solution for removing airborne mold spores from a home where mold has been proven to grow and thrive.

How Does Ozone Affect Mold?

Three atoms of oxygen make up the molecule known as ozone. Only two atoms make up the oxygen gas we breathe.

In order to interact with other elements, this additional atom must be removed from the molecule. Although ozone can also interact with mold cells and spores, this is not always the case.

Everything it comes into contact with is chemically altered by ozone. The fungus and its spores can readily be killed by ozone, which can cause alterations within them.

Are Ozone Generators Effective?

Exposure to ozone can theoretically kill mold. But this is only a theoretically possible alternative to cleanup.

Using ozone to eliminate mold can be ineffective in the real world. Mold can be killed with ozone generators, but there are too many drawbacks to this approach.

In order to begin, you’ll want to make sure your house is completely airtight. Your ozone generators can’t produce enough ozone to destroy mold until all openings and vents are sealed.

Attempting to close all of your home’s air vents is a near-impossible task. When it comes to getting rid of the mold, professional mold remediation services may be a more efficient and less time-consuming option.

As a result of oxidation, ozone affects everything. Molecules begin to break down household things as soon as they come into touch with it.

Carpets, walls, and appliances can all be damaged or destroyed by ozone. But this is just a theory for the time being.

To have an effect on the air around you, ozone generators don’t produce enough ozone to do so. These generators have yet to be proven to be successful at removing odors and killing airborne particles.

High quantities of ozone from these generators could affect not only the environment, but you as well.

Are Ozone Generators Safe?

Because ozone generators do not produce substantial volumes of ozone, they are safe to use. However, if they did, it may have negative health consequences.

If mold cells may be damaged by ozone, so can yours. Smog frequently contains high concentrations of the highly harmful gas ozone.

Living cells, such as those found in the lungs of a person, can be harmed by it.

Ozone can induce coughing, trouble breathing, and irritation of the airways when inhaled in excess. The lungs can become more vulnerable to infection when exposed to high levels of ozone.

How Do I Get Rid Of Mold In The Air?

Consider employing HEPA filters instead of ozone generators.

Mechanical air filters are High Efficient Particulate Air filters. At least 99 percent of the dust, pollen, and mold spores in the air can be removed by these filters.

In addition, keep in mind that these filters are merely precautions. Although they can remove mold spores from the air, these products will not eliminate any mold that is already in the environment.

Despite the fact that HEPA filters are quite effective, they must be well maintained. They need to be replaced and cleaned on a regular basis in order to function properly.

Thanks to their instructions, people can easily operate these equipment.

You may learn more about mold spores by reading this informative piece on how long fungus spores stay in the air (in the linked article). If you have reason to believe that mold is growing in your house, you can learn more about how to check for mold in your air ducts by clicking here.

How Do I Kill Mold?

If you want to get rid of mold, you first have to find it.

A simple visual inspection will usually reveal the location of the fungi. You may also have to rely on your sense of smell.

It is imperative that you address the underlying issue that resulted in the expansion in the first place. If there are any leaks, it’s important to patch them right once so mold won’t return.

Brushing and killing mold can then be done with DIY remedies. To get rid of the fungi, you can use baking soda, bleach, and vinegar.

Avoid combining all of the ingredients into a single mixture. When vinegar and bleach are mixed, poisonous gases are produced that can be harmful to the environment and your family.

Protective gear should be used when handling mold. You can protect yourself from the hazardous effects of spores with gloves, goggles, and face masks.

Alternatively, you can call a mold remediation professional. A professional mold removal service can utilize specialized chemicals and equipment to rapidly and effectively remove any mold from your house for a charge.

Results with Offgassing, Mold, Fragrance, Smoke

Using Ozone on Offgassing

  • Alternatively, you can call a mold remediation professional. A professional mold removal service can utilize specialized chemicals and equipment to rapidly and effectively remove any mold from your house for a charge.
  • Mold cleanup services are also available. A professional mold removal service can utilize specialized chemicals and equipment to rapidly and effectively remove any mold from your house for an additional charge.
  • A new house or a standard trailer (filled with plastics and upholstery) would be a poor choice for implementing this technique to reduce offgassing because it is both dangerous and ineffective.

Using Ozone to Break Down Mold

  • After a heavy dose of mold remediation for 48 hours, an all-metal trailer was cleaned.
  • The mold was also an issue in the house I was renting. The symptoms of my illness persisted even after the mold had been removed: swollen tonsils and pharyngitis, severe POTs, and excruciating insomnia. To go back into the house, I used the equipment to ozonate each room for 24 hours. Ozone didn’t harm the wood or anything else in the house because I removed all the fabric and pillows before ozonating.
  • Dozens of people with mold sensitivities have been able to rent automobiles, trailers, and homes after undergoing extended shock treatments.
  • I’ve used it four times now after a 24-hour shock treatment for post-remediation. This denatures mycotoxins, I’m sure of it. The 48-hour shock treatments in metal trailers have also been quite successful. During that period, I was able to take in oxygen.
  • Before mold poisons could take root, several people found it helpful to shock a room or tent and “flash” possessions.
  • Even though the 24-hour treatment caused terrible consequences in one wooden house, it was the only time this happened. It didn’t matter how much I tried to clear my head, I was still sick. Either I used too much ozone or there wasn’t enough oxygen entering the room. There’s a lot of risk involved here. I couldn’t go back into that house for a long time.
  • Using ozone for the first time was an experience that went horribly wrong, leaving me with a toxic aftertaste and strong symptoms that prevented me from returning to the rental house. All of my possessions were destroyed, too.

Using Ozone to Eliminate Fragrance, Smoke and Funky Smells

  • Removing the unpleasant smell from a piece of clothing (towel that had a smell that washing would not remove).
  • However, a 24-hour treatment left some materials, such as wool and cotton, smelling weird.
  • In addition to removing smoking odors from a vehicle or home, ozone can also improve the overall scent. Ozone is used by car dealerships, albeit in little doses and for short periods of time. For this method to function, the fragrance must not have accumulated over time and been embedded in the skin. This is unlikely to work if it is strongly ingrained.
  • This is a great option if you’re worried about the stench, especially if you’re a smoker. Once you start to notice a difference, reduce the amount of fragrance, cleaning product residue, and smoke in your home.
  • The time required to remove odors is far less than the time required to shock treat mold. This will greatly lessen the chances of something going wrong. For 15 minutes to two hours, car detailers use ozone to remove smoke and other odors from automobiles.

How to Use Ozone Safely

  • Ozone is a highly poisonous gas.
  • When an ozone machine is running, people and pets should not be in the building. Do not even attempt to inhale the fumes. You should develop a strategy for turning it on and off while holding your breath in case something goes wrong with it. The ideal is to switch it off as soon as you walk in the door (through the electrical panel or extension cord). Even if you hold your breath and walk through it, it will stick to your clothes.
  • High doses of ozone can injure anyone up to 100 feet away, including those who live next door. If using a large dose, clear 200 feet in every direction.
  • bacteria and mold can be affected by ozone concentrations of 5 to 10 times above the acceptable range for humans (Pinto). Mold can’t be treated while you’re around it.
  • To ensure that the gas is not ingested, the area should be aired out for at least 25 hours after utilizing ozone. Despite the fact that ozone is a volatile gas, it does not disperse as quickly in a sealed area with no air movement. Airing out the area is important if other VOCs (such as those listed below) are present.
  • Ozone has a half-life of 40 minutes to 25 hours. Wait at least a few days if byproducts have been generated. There should be a lot of air coming out of the windows.
  • Because the shock therapy used to destroy mold toxins is extremely dangerous if inhaled, the machines are not recommended by official government health websites (deadly if you stay in there). Even at the low levels that some manufacturers claim as safe, anyone who is sensitive to toxins will likely be harmed by them (certainly it is harmful to me). As a result, it carries a significant risk if it is not used properly. In addition, it’s tough to promote in most households because of the negative reactions listed below. Secondary interactions with materials may be impossible to avoid in many standard homes. Mammoth 10,000mg Ozone Generator, Ozone Air Purifier for Odors in Home, Car, and Large Rooms | Professional and Personal Air Sanitization Applications (10,000mg) : Health & Household

Limitations of Ozone

  • Carbon monoxide and formaldehyde cannot be removed by ozone (EPA).
  • In order to eliminate mold or chemicals, it is impossible to penetrate porous materials (EPA). Mold near the surface of porous objects, in my opinion, is denatured by this method. It doesn’t seem to travel very far.
  • However, it will have no effect on EHC or phthalates (vinyl and plastics, respectively) (Arlene Blum)
  • Work may not be effective on clothing and footwear (Pinto). I’ve found that any type of fabric causes a severe reaction when used in large amounts. Even leather shoes have been successfully remedied by several people. Despite the fact that not all leathers and rubbers will keep up the same, shoes can last for a long time.

Negative Reactions and Byproducts of Ozone – What Can go Wrong!

Some chemicals react unfavorably to ozone, resulting in an increase in VOCs. To a few examples, here are a few:

  • Carpets have been replaced (EPA)
  • Smells of active tobacco (EPA)
  • Formaldehyde is a product of terpenes (CDH)
  • Styrofoam (EHC)
  • Pinine-based floor finish (Pinto)
  • tiling on the ceiling (from a client of mine)
  • a worn-out rug (from a client of mine)
  • a variety of textiles (from my experience and from clients)
  • This is the wall I’m talking about (from a client)

If you expose porous materials to high doses of radiation for an extended period of time, I’ve discovered a harmful consequence. Everything gets oxidized by ozone, which produces an unpleasant odor in the process.

Anhydride, ester, carboxylic acid and unsaturated hydrocarbon structures are among the results of cotton oxidation.

Mold toxins can be removed with high doses of ozone, but this can also damage or degrade some materials, such as:

  • Plants can succumb to the elements and succumb to death.
  • Natural rubber and latex are particularly susceptible to degradation.
  • SBR is susceptible to degradation (tires, many shoes, some gaskets, liquid waterproofing in basements, parts of electronics like in speakers, in lithium-ion batteries, and gasketed-plate heat exchangers).
  • In comparison to other rubbers, nitrile is more easy to degrade.
  • In time, caulking can fail.
  • See the two lists below for information on the degree of vulnerability of various forms of plastic.
  • Fabric
  • Nylon is a very weak material that can easily broken down.
  • Several pieces of art
  • Stainless steel will corrode if exposed to the elements.

Obviously, this is not an exhaustive list, and there may be other items around the house that contain these ingredients. And there are many additional materials that haven’t been put to the test as well.

I’ve performed numerous high-dose ozone treatments (shock treatments) without breaking down any electrical wire coverings. With order to protect them from ozone breakdown, most wires are covered in a PVC coating. The ozone will eventually ruin it.

Electricity can be a threat if the wires are covered with a different type of plastic or rubber. This hasn’t happened to me, but it is possible. Please verify that you have the correct type of wiring. Additionally, SBR may be found in electronics, which is far more susceptible.

Electronics can be successfully ozonated by ordinary people. Breaking down electronic components and causing an electric shock could be dangerous if you don’t know what kind of polymers are in it.

These eight plastics are more able to withstand exposure to ozone than others.

In the past, I’ve seen Taylor guitars successfully repaired.

How to do an Ozone Shock Treatment

Everything made of cloth, including beds, should be removed or wrapped in plastic as a shock treatment.

Remove all plants, animals, and artwork that is not behind glass from the room. Tape electrical outlets. It’s time to get rid of all technological devices. Before you start the machine, double-check that you have everything you need.

While turning it on and off, hold your breath. (Or use an extension cord or cut it from the breakers). Expel 25 hours of fresh air into the room. Based on my own experiences, here is what I have to say.

Do your homework to determine if something is risk-free for you to try. Make sense of why the EPA doesn’t support it. It’s too easy to make a mistake when you’re able to inhale some air. Treat it as though it were a lethal gas.

It’s a last-resort remedy if you’re unsure how it will affect your carpet, walls, or ceiling.

All shock treatments are considered a last resort by me.

You might also start with a little dose to see if any strange odors develop.

In order to run it 24 hours a day, it needs an oxygen supply, so make sure it’s dosed correctly.

Your home might become unbearable if you go overboard. When I overdosed on the ozone lately, it took me a month to get back into the water.

How to Dose Ozone

3500 mg/hr in a medium or big room is usually enough for a shock treatment. One milligram per hour (mg/h) of a shock treatment, which kills and usually denatures the mold, is typically applied to 100 square feet (at 70 degrees with relative humidity at or below 20 percent ).

You should strive for a concentration of between 6 and 10 parts per million. For most individuals, the shock lasts between one and three hours, but for those of us who are more sensitive, the shock continues until the chemical is denatured. An extremely small trailer has allowed me to go up to 500 and 700 mg/hr for 24–48 hours at a time.

The Jenesco Ozone Generator with an output of 100-2100 mg is one of my favorites. Also, there are little, low-cost 5000 mg pills available on Amazon with a “hold” option.

Why is Ozone Dangerous?

Three atoms of oxygen make up the small molecule known as ozone. As a result of its reactivity, this gas is highly volatile and potentially poisonous. Ground-level ozone is a major component of the smog that engulfs major cities in the summer and has been linked to a number of health problems.

Health Effects of Ozone

High amounts of ozone can cause a number of health problems, according to the Environmental Protection Agency (EPA). Some of the symptoms that may be present include a diminished ability to breathe and a heightened sensitivity to respiratory infections in the airways. Ozone’s ill effects can be perpetuated by activities that increase breathing rates (such exercising indoors), certain pre-existing lung ailments, and longer exposure time, according to the researchers.

4 Reasons Why You Should Avoid Air Purifiers that Produce Ozone

In addition to being potentially harmful to your health, ozone also has the potential to fail completely. Here are four reasons to never use an ozone-producing air purifier.

1. Ozone Generators May Not Work at All

It’s said that ozone, which has a chemical reaction, can neutralize practically all household chemicals. In fact, a thorough evaluation of scientific data has shown that the chemical reaction process may take months or even years to eradicate many of the harmful compounds prevalent indoors. Carbon monoxide cannot be removed from the air by ozone, as has been shown in other research (PDF). Ozone applied to indoor air pollution does not efficiently remove viruses, mold, bacteria, or other biological pollutants when employed at amounts that do not violate public health regulations.

2. The Chemical Reaction Can Be Dangerous

Everyone should be informed of the possible side effects, regardless of whether ozone generators are demonstrated to be helpful in eradicating harmful substances. A wide range of hazardous byproducts are formed when ozone reacts with many substances. There are a number of harmful organic compounds that can be generated when new carpet chemicals and ozone are combined together in a laboratory setting. As a result, the procedure was sped up because of the harmful byproducts.

3. Ozone Generators Do Not Remove Particulates

The fact that ozone generators do not remove airborne particulates like dust or pollen is another another consideration when evaluating this technology. Allergy-inducing particles are included in this classification. Some ozone generators have an ionizer that releases negatively charged ions into the air to counteract this. Recent studies have shown that this technique is less effective than HEPA filters and electrostatic precipitators for removing airborne molecules of dust, smoke, pollen, and mold spores.

4. It Is Impossible to Predict Exposure Levels

As the EPA points out, it’s becoming increasingly difficult to accurately measure the concentration of ozone created by an ozone generator. If more powerful devices are deployed in smaller areas, the concentrations will be higher. Whether or not the interior doors are closed rather than open will affect concentrations as well. Additional factors which affect concentration levels include how many materials and furnishings are in the room to react with ozone, the level of outdoor air ventilation, and the proximity of a person to the ozone generating device.

How Does Ozone Kill Mold? A Detailed Guide For Mold Removal - Krostrade


According to the EPA, the actual concentration of ozone created by ozone generators is becoming difficult to quantify because so many factors come into play. It will be more difficult to maintain concentrations if more powerful devices are employed in fewer areas. Closed or open interior doors have an impact on concentrations as well. In addition to the number of materials and furnishings in a room that react with ozone, ventilation levels, and the closeness of an individual to the ozone generating device, there are other elements that affect concentration levels.

Ozone must be extremely concentrated in order to be harmful to you and everything in your home.

It’s recommended to stay away from ozone when dealing with mold. To get better results, you can make your own DIY treatments or hire professionals.

You should never use an ozone generator to clean the air in your home or office for any of these reasons:

Mold Denaturement and Death by Ozone

It’s possible that an ozone generator can kill mold by altering its molecular structure.

Helen Skeates

Helen Skeates

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