The Right Way To Ventilate
Both the Environmental Protection Agency and the National Institute for Occupational Safety and Health recommend that if smoking is permitted in an enclosed workplace, it must be limited to enclosed areas with a separate ventilation system.46 47
Air from this designated area must be exhausted directly to the outside and not recirculated within the building or mixed with the general dilution ventilation for the building.48
The area must have negative air pressure. This results in air flowing into the smoking room from adjacent parts of the building rather than the smoke-filled air escaping out into the broader building environment.49
Workers should not be required to enter the separately ventilated smoking area to perform work duties.
46 US Environmental Protection Agency. Environmental Tobacco Smoke. Indoor Air Facts No. 5. US EPA, Office of Air and Radiation. Washington, DC: US EPA, June 1989.
47 National Institute for Occupational Safety and Health. Current Intelligence Bulletin 54: Environmental Tobacco Smoke in the Workplace: Lung Cancer and Other Health Effects.