Do Ozone Generators Kill Mold? Usage and Safety

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Ozone generators are devices that emit ozone which is used for removing air pollutants. They simply disinfect the air by removing germs and odors. In some cases, ozone generators are also used in purifying water. Ozone generators kill mold but only when they produce ozone at unsafe levels for humans and other living creatures.

Ozone is capable of killing mold spores in the air. Still, household ozone generators are regulated to produce ozone at safe levels, which may not be sufficient to kill mold instantly on porous surfaces and those found in hidden areas. At safe levels, ozone doesn’t kill mold or other organisms.

Do Ozone Generators Kill Mold?

How do ozone generators work?

Ozone generators create ozone (O3) through the following methods:

1. Ultraviolet radiation

Ultraviolet radiation splits oxygen into individual atoms, which can then combine with oxygen (O2) to form ozone gas. This method is similar to how the sun’s UV rays create ozone in the upper parts of the earth’s atmosphere. This method is, however, quite inefficient and requires lots of UV radiation.

2. Silent corona discharge

Electrical discharges split oxygen molecules into individual oxygen atoms. The atoms then attach themselves to oxygen molecules (O2) to form ozone (O3). This process is much more efficient than UV radiation. In nature, electrical discharges such as lightning produce large amounts of ozone at once.

At high concentrations, ozone is very effective in attacking and killing mold, its spores, and mildew. The gas has abilities to deteriorate the cell structure of most microorganisms. When attached to the mold, ozone molecules stop them from multiplying and eventually eradicate them.

Some types of ionizing air purifiers emit ozone and also produce negatively charged ions that attract various forms of dust particles found in the air, including mold. Others also have a collecting plate where the heavy particles get collected. And those without a collecting plate, the heavy particles land on surfaces and are later cleaned out. 

How Ozone Generators Kill Mold

In dealing with the menace of mold, you need first to remove all moisture content so that you can avoid mold growing back after cleaning your home. Ozone is a gas found in the upper atmosphere that protects us from harmful radiation.

It is essential, however, to note that when ozone is found near the earth’s surfaces, it becomes harmful and causes skin cancer, and lung damage, among other health complications. 

Ozone generators are regulated in terms of the amount of ozone gas they emit. The gas can effectively kill mold in large quantities than what is approved for use in homes. The more concentration, the more effective it becomes in killing mold spores.

Some ozone generators do not effectively kill mold and other biological pollutants because they emit a small amount of ozone gas. They mostly work by trapping the mold spores and making them heavy so that they settle on other surfaces and are later be cleaned up. They do not literally kill mold but just remove it from the air. 

Further, ozone generators do not effectively kill mold from materials like air conditioning duct lining and ceiling tiles. This is because they mainly focus on airborne particles. Therefore, do not expect ozone generators to kill all the mold in your central air conditioner

It is important to note that ozone generators do not kill mold entirely on their own; you need to clean the affected area with antimicrobial cleaners.

You can also use air purification systems that have the option to remove and kill mold such as these:

Bestseller No. 1
Puraclenz Core Air & Surface Purifier – H13 True HEPA Removes Allergens, Smoke, Dust, Pollen + PCO Purification Destroys Mold Spores, Viruses & Bacteria Mid-Air & On Surfaces; Covers Up To 1,575 SqFt
  • A GAME CHANGER IN AIR & SURFACE PURIFICATION: Introducing Puraclenz Core, the air and surface purification system that combines the performance of True HEPA with our patented photocatalytic oxidation (PCO) technology to deliver a one-two punch, cleaning both air and exposed surfaces in indoor spaces. State-of-the-art HEPA filtration draws in air to remove pollutants while PCO purification emits ions to deactivate mold, viruses, and bacteria, cleaning anywhere you step, touch, or breathe.
  • FILTERS 99.97% OF AIR PARTICLES: Our multi-stage air purification system filters out dust, pollen, pet dander, smoke, and allergens. First, a pre-filter removes large particles while H13 True HEPA traps particles down to 0.1 microns. Activated carbon captures odors and volatile compounds, while germicidal UV-C light destroys pathogens that cling to and pass through the filters.
  • STOPS MOLD GROWTH, VIRUSES, & BACTERIA IN HARD TO REACH PLACES: Puraclenz’s patented PCO purification generates invisible ozone-free ions to proactively destroy mold spores, viruses, and bacteria mid-air and on exposed surfaces. PCO works where HEPA filters simply can’t reach, even on hard-to-clean surfaces such as walls and furniture. Our PCO ionization technology is certified ozone-free so it’s safe for people, pets, and plants.
Bestseller No. 2
Puraclenz Photon Surface & Air Purifier – Stops Mold Growth, Destroys Viruses & Bacteria, Reduces Lingering Odors 24/7 – Patented Ozone-free Ion Technology – P1500 for Spaces Up To 1500 Sq. Ft.
  • STOP MOLD GROWTH & REDUCE ODORS: Puraclenz Photon is over 99% effective at deactivating mold spores on exposed surfaces. Say goodbye to lingering odors caused by mold, mildew, and bacteria in even the darkest, hardest-to-reach nooks and crannies in your home.
  • DESTROY VIRUSES & BACTERIA: Our patented photocatalytic oxidation (PCO) technology is shown to be over 99% effective at destroying viruses and reducing dangerous bacteria mid-air. Intercept and neutralize pathogens present in the air and on exposed surfaces before they can reach you.
  • SAFE FOR PEOPLE, PETS, AND PLANTS: Puraclenz is certified ozone-free. Our patented purification technology evolved from the same science that provided clean air to astronauts in the International Space Station. Now in your space, effectively deactivate pollutants without any harm to loved ones.
Bestseller No. 3
Puraclenz Photon Replacement Screens R0001 (2-pack) – For Puraclenz Photon Models P3000, P1500 and P750
  • PROTECT YOUR PURACLENZ: Puraclenz Photon Screens protect your air purifier by preventing large particles like dust, hair, insects and fibers from entering the system and negatively impacting functionality. These screens are great for prolonging the life of your purifier and improving overall efficiency.
  • REPLACE SCREENS SEMIANNUALLY: The screen needs to be replaced or washed every 6-7 months depending on the air quality of the installation space to ensure optimal Puraclenz performance and protection. This time duration assumes 24/7 continuous use.
  • REPLACEMENT INDICATOR LIGHT: The Puraclenz Photon Purifiers include an indicator light on the user interface that automatically notifies you when it is time to change or wash the screen so you never have to guess.

How Long Does Ozone Take to Kill Mold?  

Mold spores can generally be killed by ozone in an average of 3 to 6 hours. This is, however, dependent on the concentration levels of the ozone. An estimate of 24 to 48 hours has also been proven effective.  

With a high ozone concentration, it shall take a relatively shorter time for it to kill the mold and mold spores. The vice-versa is valid with low levels of ozone concentration.  

It is also very important that you root out the cause of the mold before using ozone generators. This is important because ozone only kills the mold but does not eliminate it if the conditions favor its growth.  

Before using the ozone generators, the removal and clean-up of mold should first be carried out. Ozone generators mainly concentrate on airborne mold spores. This implies that it is a clean-up process preceded by other cleaning forms. 

Can you be in a House with an Ozone Machine?  

The safety of the ozone machine mainly depends on how well you use it and the space in which you put it. It’s not safe to be in the same room with an ozone machine since ozone gas is harmful to the health of animals, plants, and human beings.

We have pets that stay in our houses and like birds especially, they do not put up with large amounts of ozone. For human beings, when you breathe in ozone or be exposed to it, it causes lung and skin damage, among other health hazards.  It is more harmful to young children with a developing immune system and to people with pre-existing medical conditions. 

Since ozone disintegrates at a relatively fast rate, a maximum of 4 hours should be enough time before the occupants of the house can move into an area that had an ozone generator. 

Another concern about not being in a house with an ozone machine is that ozone reacts differently to different materials. This has been proven when items like carpets are corroded due to exposure to ozone. Being in a place where the ozone machine is, therefore it is harmful. 

How Long Does It Take for Ozone to Dissipate?

To dissipate is an irreversible reaction of an agent or a molecule to disappear. Therefore, our context means the time required for ozone gas to go away or become a different element altogether. After using an ozone generator device, you need to know how long it takes for ozone to dissipate so that the place is once again safe for habitation. 

There is no specific time that we can conclusively say that ozone takes to dissipate. It largely depends on the concentration of the ozone gas. Ozone typically lasts for an estimated time of between 30 minutes to 4 hours. Here, the third oxygen atom breaks away from the other 2 oxygen atoms and forms safe and breathable oxygen. 

If the ozone levels are highly concentrated, it shall take between 3 to 4 hours for ozone to dissipate. It is therefore recommended that you wait for 4 hours after switching off the ozone generator before you can return to that place where it was. 

The type of ventilation you have also determined the dissipation time. A good ventilation system will mean that the ozone gas shall disperse faster than a poorly ventilated place. Temperature levels also determine the rate of dissipation. Warm temperatures break down ozone molecules faster than cold temperatures.

Final Thought

Mold and mildew are very harmful, and similarly is the ozone gas. It is essential if you explore other safe forms of mold remediation and mainly focus on preventing mold growth in your home. While you can use ozone to kill mold, using it within the public health standards isn’t enough to kill mold.


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