I would not spray canned ozone on the plants.
You do need an uv-c/ozone generator.
CAP makes one for around $125.
I have not measured the ppm but I went with
a "If I can smell it, it must be there" logic.
kind of like natural gas. I do not have
any ozone overdose on my plants at 15 min
every 2 hours.
I have no ill complaints from my household as to
any type of ozone exposure. I do keep my pets
out of the room when my generator is active,
however I have been in the room before
whilst the generator is on and have not experienced
any symptoms of ozone toxicity.
a spike in ozone within the atmosphere
does occur naturally after a rain.
The rain smell in the air is ozone.
Toxicity symptoms include lung irritation and
difficulty breathing. However it usually
requires prolonged exposure >24 hours
or extremely high doses. Somewhere near
hospital levels.
Because ozone has a half life of ~30 min
then decays into o2, a two hour wait time
between bursts seems to keep levels up enough
to neutralize any nasties but low enough to
not be harmful to any of my household, animals
included.