Might be OK if they don't sell it for use in inhabited buildings, but otherwise it's not really any safer than drinking bleach. Not everything that kills viruses is safe for people. https://www.epa.gov/indoor-air-quality-iaq/ozone-generators-are-sold-air-cleaners#:~:text=When%20inhaled%2C%20ozone%20can%20damage,of%20breath%20and%20throat%20irritation.&text=Exercise%20during%20exposure%20to%20ozone,risk%20of%20harmful%20respiratory%20effects.
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