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O3 is again not good for us. Not breathe it and die but it attacks your lungs if you inhale too much.
Does it have an active poisonous effect, or is it just dangerous because it's not breathable?
O3 (Ozone) is effectively airborne bleach. The molecule is 'happy' to dump an oxygen and become O2, the last O needs something to bind to however. Large, complex hydrocarbons are particularly vulnerable to damage from this. Unfortunately, our bodies are basically made of complex hydrocarbon chains. While our skin is quite resistant to damage (we have an ablative layer of dead skin cells), our lungs and eyes aren't. Ozone will do significant damage, in even small doses.
Luckily, the same thing that makes it dangerous also makes it unstable. O3 breaks down to O2 relatively quickly (20 minute half-life, I think). It's also amazing at decontaminating and deodorising a room or building. Bacteria, viruses and VOCs(volatile organic molecules, aka smelly stuff) are particularly vulnerable to damage from O3. You just have to remove anything you don't want to damage (like houseplants, pets, or children), and keep the place relatively sealed to not pollute the area too much.
This high propensity for reaction is also why we got a massive hole in the ozone layer. Aerosols and hydrocarbons got dumped into the atmosphere, causing a massive portion of our ozone to split into O2 and free O due to higher exposure to UV radiation. All of that newly freed singular oxygen then started binding with the hydrocarbons in the upper atmosphere instead of reforming into ozone, heavily depleting it over time