Quick answer: No, ozone generators should not be run where people or pets are present. The EPA advises against using them as air cleaners in occupied spaces, noting that ozone at levels within public health standards does little to most indoor air contaminants. Filtration, ventilation and humidity control work better.
What is ozone?
Ozone is a molecule made of three oxygen atoms, and whether it helps or hurts depends on where it is. High in the atmosphere, the ozone layer shields the earth from much of the sun’s ultraviolet radiation. At ground level, ozone is an air pollutant and a major ingredient in summer smog. That’s why Central Texas gets ozone action days on hot, still afternoons, usually the same ones where the heat shimmers off the highway.
Indoors, ozone can drift in from outside or be produced by certain devices. Some machines, often sold as air purifiers or odor eliminators, make ozone on purpose. Outdoor ozone is part of the EPA Air Quality Index; you can see today’s Austin reading on our live air quality index.
Why shouldn’t you run an ozone generator in an occupied room?
Because a level of ozone that’s safe to be around is too low to clean much, and a level high enough to clean isn’t safe to be around. Ozone is a reactive gas. That reactivity is what makes it tempting for odor control, and it’s also the problem. The EPA notes that ozone can irritate the lungs, and it advises against using ozone generators as air cleaners in occupied spaces. The agency also points out that at concentrations that don’t exceed public health standards, ozone has little effect on most indoor air contaminants.
There’s more. Ozone can react with other chemicals in indoor air, such as those from cleaning products and air fresheners, and form new compounds. Over time it can also break down materials like rubber seals, some fabrics and artwork. It’s not a great houseguest.
When is professional ozone treatment used?
Professional ozone treatment is a specialized tool, used for jobs like odor treatment after smoke or fire damage. Done correctly, it happens in an empty space under controlled conditions: people, pets and plants are out, the concentration and run time are managed, and the space is aired out and back to normal before anyone goes back in.
That’s a very different thing from a consumer ozone machine humming away in a bedroom or living room. Even in professional hands, ozone is a niche tool, and in most situations another approach fits better.
What works better than ozone for everyday air quality?
Capturing particles, bringing in fresh air, controlling humidity and removing the source of the problem. In practice:
- Filtration: The right HVAC filter for your system, or a HEPA air cleaner, physically captures particles without adding anything to the air.
- Ventilation: Bathroom and kitchen exhaust fans vented outdoors, plus whole-home ventilation where it makes sense, dilute and carry away pollutants and odors.
- Humidity control: Keeping indoor humidity in a moderate range, around 40-60%, helps limit mold growth and musty odors, which matters a lot in humid Central Texas.
- Source control: Finding and removing the cause of an odor, whether it’s a leak, a dirty drain pan or chemicals stored in the garage, usually works better than covering it up or treating the air.
- Zero-ozone certified products: If you add an electronic air cleaner or purifier, look for UL 2998 certification, which verifies no measurable ozone output.
If mold is behind the smell, ozone isn’t the answer. The fix is solving the moisture problem and having the affected areas properly assessed and remediated.
The bottom line
Ozone gets marketed as a quick fix for odors and indoor air, but ozone generators don’t belong in rooms where people and pets live. The EPA advises against using them as air cleaners in occupied spaces, and professional ozone treatment is a specialized job done in empty, controlled conditions. For everyday air quality, stick with filtration, ventilation, humidity control and removing the source, and choose zero-ozone certified products if you add an air cleaner. If something in your home’s air seems off, we’re happy to help you figure out what’s behind it.
Related guides: Bipolar Needlepoint Ionization: What It Is and What to Know, Air Purification Systems: Choosing the Right One for Your Home and Indoor Air Quality Beyond Mold: Dust, VOCs, Filtration and Upkeep.
About Gold Eagle Services: This guide comes from the team at Gold Eagle Services, a family-run Austin HVAC, indoor air quality and mold remediation company founded in 2017. We’re licensed (TACLA119235 and RCO1783), insured and bonded, and we serve homes across the greater Austin area.
Need help with this in your home? Learn about our indoor air quality solutions, or call 512-489-4653 to schedule a visit.
