Probably
the hardest IAQ pollutant to get rid of is tobacco smoke, because there are so
many components and even high-quality air filters just can’t do the job.
My son, who is a musician, had to play in a casino a couple of weeks ago, and
he and the entire band complained about all the cigarette smoke. And although
the casino (like almost every bar you might enter) has good air filtration,
that simply isn’t enough, for although you may not be able to see the smoke,
the strong odor is still there and quite objectionable.