The short answer
What Ozone Generators Do
Ozone generators are powerful machines used by water damage and mold remediation professionals. They produce ozone gas, or O3, to neutralize stubborn odors at a molecular level. This includes smells from smoke, pet accidents, and the musty odors caused by mold or lingering water damage. The machines are typically used in unoccupied spaces because ozone can irritate lungs.
Safety and Ventilation Are Critical
Ozone is a lung irritant and should not be inhaled. After a treatment, the space must be thoroughly ventilated until the smell is completely gone. The pros will air out the area, but you should wait for their all-clear before re-entering. If you smell ozone unexpectedly, it could indicate a machine was left running or is malfunctioning. This underscores the importance of proper procedure and waiting for official clearance from the pros on site.
- Wait outside until the smell has fully dissipated.
- Open all windows and doors to create cross-ventilation.
- Do not run air purifiers that may recirculate the gas.
- Keep pets and plants out of the treated area.
- If you feel shortness of breath, go to fresh air immediately.
- Ask the pros for their recommended wait time before returning.
Connecting the Smell to Water Damage
If you're noticing an ozone smell after water damage, it's a sign that odor removal was part of the restoration. Persistent dampness under flooring can cause severe mustiness that standard drying doesn't eliminate. In certain climates, even those with dry periods, hidden moisture trapped in subfloors or behind walls can still lead to stubborn odor problems. The pros may use ozone after they have first addressed the water source and thoroughly dried the structure.
When the Smell Lingers Too Long
A faint ozone smell should fade within a few hours after proper ventilation. If the sharp odor persists for more than a day, there may be an issue. The generator might have been set too high, or the room may not have been aired out enough. In some cases, lingering dampness continues to produce odors, requiring further inspection and drying by the professionals. It can also indicate a need for more aggressive airflow with fans placed strategically to clear the gas from the entire treated area.
Next Steps for Homeowners
Your priority is safety. Do not stay in a room with a strong ozone smell. Contact the water damage restoration professionals who performed the work to report the lingering odor. They can advise on further ventilation or check for remaining moisture. If the smell appeared without a known treatment, consider a professional inspection for hidden water damage or mold that a previous occupant may have tried to mask.
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Call Now (208) 537-2633Frequently asked questions
Is it safe to be in my house if I smell ozone?
No, it is not safe. Ozone irritates the lungs and can worsen conditions like asthma. You, your family, and pets should leave the area immediately. Ventilate the space by opening windows and doors, and only return once the sharp smell has completely vanished.
Could the ozone smell be coming from something else?
It is unlikely. The distinct smell is strongly associated with ozone generators. Some air purifiers marketed for homes may produce small amounts, but a strong smell typically indicates professional-grade equipment. If you did not schedule a treatment, investigate for signs of undisclosed water damage or previous remediation work.
What should I do if the smell won't go away?
First, ensure all windows are open for maximum airflow. If the odor persists beyond a day, contact the professionals who did the work. The lingering smell could signal inadequate ventilation or that the underlying moisture problem was not fully resolved, requiring further drying or inspection.