Didn't expect to be writing a positive review, but here it is. This air purifier actually works. It puts out ozone which kills any odors. It leaves the car smelling a bit like a hospital (clinically clean smell). It only took about one day and now I just leave the purifier in the glove compartment until I might need it again.It has a faint blue glow to signify that it's working. The glow isn't too bright and isn't too offensive.