Ozone treatment questions

Start with the household guidance

Health Canada advises against ozone-generating air-cleaning devices in homes. Do not use this page or the method tool to choose a dose, duration or re-entry time. Neither provides operating instructions.

If a provider proposes a reactive treatment for a restoration project, ask for the exact method, responsible expertise, applicable controls, product/equipment information and documented completion criteria. A promise to “run it while everyone is out” does not answer those questions.

Keep source work ahead of a broad claim

Ask what source or retained material has been assessed and which work precedes the proposed treatment. Distinguish the intended odour effect from material assessment, particle control and occupancy decisions. A temporary change in smell is not proof that every relevant question has been resolved.

The written scope should state compatibility, limitations and any relevant by-product or monitoring questions. The provider must establish the actual plan; a website comparison cannot approve it.

Ask for explicit responsibilities

• Who establishes access and occupancy arrangements?
• Which exact equipment/process is proposed?
• What evidence supports the intended result?
• What conditions determine completion and return to use?
• Who investigates an unsuccessful result or recurrence?

Do not copy a timer from another project

A room size or elapsed time alone cannot establish a safe re-entry decision through this website. Keep the actual procedure and responsible professional’s evidence with the project record. Seek appropriate advice before agreeing to treatment.

References and scope

1. Improve indoor air quality in your home — Health Canada.
   Source control, ventilation and limits of filtration/testing; ozone generators are not recommended in homes.
2. Using a portable air cleaner — Health Canada.
   Household particle filtration and device selection; not a restoration containment design.
3. ANSI/IICRC S700: fire and smoke restoration — IICRC.
   First edition2025; published scope only. Wildfire and exposure evaluation are not comprehensively addressed. The paid standard has not been reproduced.

Source links checked September30,2026. General guidance and original planning questions do not establish the condition, exposure risk or clearance of a property.