Yeah even if the ozone machine gets surface level contaminants out, that says nothing about chemicals that penetrate into the fruit itself.

Cherries for example, are often sprayed with a hardening agent prior to being picked. This is to make it so the skin can stand up to the rigours of being picked, sorted, packed and shipped with minimal casualties. This chemical penetrates through the thin af skin of the fruit and can never be removed. As a picker they make you wear N95s (on good orchards, bad ones don’t mention it at all) because if you get someone pregnant after inhaling a bunch of this chemical in the trees, the children are at greater risk of birth defects. But as far as eating this chemical goes, if you eat too much in one sitting you get the runs like any low fibre fruit but otherwise it’s totally safe.

Edit: fixing bad autocorrect