With professional UV EPROM erasers, you can get a tiny/slight whiff of Ozone smell from them. If they have been on a long time (30+ minutes), and there isn't much air flow, around the area.
But this is usually only a small amount of smell, which soon dissipates.
Laser printers, especially the really old ones from 10/20 years ago, sometimes gave off noticeable smells of Ozone.
Due to the
UV lamp, which erases the laser drum (or whatever it is used for in a laser printer).EDIT (crossed out section, replaced below):
Please see next post in thread:
Corona wire - High voltage.