Ozone is often used to remove smells. Ozone takes care of smells like (cigarette) smoke, fire and many more things. Ozone air purifiers are used in spaces like rooms, offices and business premises. This device produces ozone and spreads it around the room using a strong fan.
In the industry, smells are mostly taken outside into the environment. A big dose of ozone is injected in the air outlet for this purpose. A UV light can be installed to neutralise the ozone again.