Smell: Musty, sour, urine-like, or damp scents usually signal fungal growthnot terpenes
Also, the air conditioning and ventilation for smoking rooms should only be serving that space
My tested units: Ozone-Free: IQAir, Austin Air, LEVOIT, Alen Flex Optional Ionizer (Can Be Disabled): WINIX 5510 (PlasmaWave) My advice: If you or anyone in your household has asthma, COPD, or young children with developing lungs, choose a purely mechanical filtration system with no ionizer
This guide explains why the smell sticks around, what needs to happen before painting, and how a proper repaint can remove the odour for good
For example, two purifiers can both say they work in a large room. One may clean smoke much faster than the other