To solve a problem in an air cleaner wherein the exhaustion of air after treatment containing dust, odor components, or gaseous hazardous material to a non-smoking space can seriously damage the human health, because the dust cannot be collected 100% completely by a dust collection filter, an electric dust collector, or the like even when the smoke of a tobacco is directly sucked and treated, and various odor components contained by the smoke of the tobacco cannot be completely adsorbed or decomposed by an activated carbon filter, a photocatalyst deodorization, or the like.

The air cleaner exhausts smoke of the tobacco containing hazardous material to the outside by the air cleaner, and simultaneously prevents the smoke of the tobacco that cannot be sucked directly from flowing out to the non-smoking space with an air curtain flow generated utilizing cleaned air in the non-smoking space while maintaining the smoking space in a negative pressure state.

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