I was wondering how toxic ozone gas actually is. I heard that refrigerators and air-condition emits ozone gas. I heard something like if you breathe in ozone too much, you won't be able to smell it anymore. At first, it has a distinct smell... but once you get use to it, I think someone told me something like it "temporarily shut downs your olfactory glands." Is this true? Do a/c and fridges emit ozone? Is it toxic?