I know what Ozone smells like (I remember the old laser printers that were also effective ozone emitters), but trust a sensor more than my ability to smell low levels of Ozone.
My air purifier is built into the furnace ductwork so it's already pretty diluted air by the time it comes out of a duct.
> My air purifier is built into the furnace ductwork
That's neat! Do you know if the ozone is produced before or after it reaches the blowing mechanism? I ask because if it is produced before, like right after the air intake, that's a really great setup for keeping your ductwork mold and mildew free. I've wanted to buy such a system but keep holding out for things to get cheaper... in the meantime, I use an ecoquest "FreshAir" model sitting on top of the fridge.
My air purifier is built into the furnace ductwork so it's already pretty diluted air by the time it comes out of a duct.