TECHNOLOGY · OZONE EXPLAINED

Ozone Indoors: Dangerous Gas or Powerful Air-Treatment Technology?

Ozone is often discussed in absolutes. The science is more nuanced. What ozone is, where we encounter it naturally and why concentration, exposure and application matter.

17 Sept 2026

MIN READ

EXECUTIVE SUMMARY

• Ozone isn't simply “good” or “bad”. Concentration, exposure and application matter.

• Ozone occurs naturally in our atmosphere. At elevated concentrations near ground level, however, it becomes an air-quality and health concern.

• Indoors, the environment changes. Room size, ventilation, operating time and device output all influence the concentration people may actually be exposed to.

• This is why application matters. Different spaces and problems require different configurations.

• OZONOS uses controlled ozone for air treatment. The technology is designed around defined applications rather than a one-size-fits-all approach.

THE QUESTION ISN'T SIMPLY: OZONE — YES OR NO?

IT'S: HOW MUCH. FOR HOW LONG. AND WHERE.

OZONE

GOOD OR BAD?

Think about sunlight.

We need it. We enjoy it.

Stay exposed for too long, and it can harm us.

The sunlight didn't change. The exposure did.

Ozone also needs context.

It occurs naturally in our atmosphere. High above Earth, the ozone layer protects us from harmful ultraviolet radiation. Closer to the ground, elevated ozone concentrations can become a health concern.

Same molecule.

Different concentration. Different exposure. Different environment.

CONTEXT CHANGES EVERYTHING.

NOW WALK INSIDE

THE ROOM CHANGES THE EQUATION.

Imagine a large hotel lobby.

Now imagine a tiny room with the door closed.

Use the same ozone-emitting device in both and the concentration in the air will not necessarily be the same.

Room volume matters. Ventilation matters. Output matters. Time matters.

This is why a device's ozone output cannot simply be compared with an exposure guideline and labelled “safe” or “unsafe”.

The WHO's 2021 air-quality guideline for ozone uses 100 µg/m³ as the daily maximum eight-hour mean for short-term exposure.

That's a concentration in the air people breathe — not a device-output specification.

DEVICE OUTPUT IS ONE NUMBER.

EXPOSURE IS THE REAL-WORLD RESULT.

SO WHY USE OZONE AT ALL?

BECAUSE OZONE IS REACTIVE.

And that is exactly what makes it interesting for air treatment.

Think of a hotel room after the previous guest has left.

The bed is made. The surfaces have been cleaned. Everything looks perfect.

But an odour remains.

You can spray fragrance into the room.

Now you have the original problem — plus another smell.

Or you can treat the source in the air and on exposed surfaces.

That's the fundamental difference between masking and treatment.

DON'T MASK IT. TREAT IT.

THIS IS WHERE OZONOS COMES IN

CONTROL STARTS WITH THE APPLICATION.

OZONOS uses UV-C-based technology to generate controlled ozone from oxygen in the air.

But not every space is treated the same way.

The AC-II Smart Standard, for example, is specified by OZONOS at 0.048 ppm and designed for continuous operation in applications including living and sleeping areas, offices, conference rooms and waiting areas.

For larger spaces or more intensive treatment, the AC-II Smart Pro is specified at 0.115 ppm.

Different room.

Different requirement.

Different configuration.