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The HEPA layer captures fine particulate matter down to 0.3 microns, while the activated carbon adsorbs gaseous pollutants, volatile organic compounds (VOCs), and odors that HEPA alone cannot trap

To put that in more-familiar terms, 1.0 inch wc is approximately 0.036 psi

"Impact of Canada's menthol cigarette ban on quitting among menthol smokers: pooled analysis of pre-post evaluation from the ITC Project and the Ontario Menthol Ban Study and projections of impact in the USA"

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"Even in countries where tobacco industry payment for product placement is prohibited by law, more than half of films contain tobacco countries without these policies were even more likely to show tobacco use on screen." Thrasher and his colleagues compared 502 films produced in the U.S

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