Ozone is a tasteless, colorless gas made up of three oxygen atoms. It can be found in the upper atmosphere and is naturally produced by thunderstorms during electric discharge.

It is perfectly safe indoors if kept at acceptable levels (between .02 and .05 parts per million), just like many other type of naturally occurring gasses that aren't harmful to us at certain levels. Ozone air purifiers have been developed to produce the correct amount of ozone to purify the air without reaching harmful levels.

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