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Study confirms the risk of exposure to secondhand tobacco smoke outdoors

e current EPA outdoor standard."

Outdoor tobacco smoke consists of brief plumes that sometimes exceed 1,000 micrograms, Klepeis added. "On the other hand, clean air typically contains less than 20 micrograms of PM2.5," he said. "Therefore, a person near an outdoor smoker might inhale a breath with 50 times more toxic material than in the surrounding unpolluted air."

However, the researchers found that air quality improved as they moved away from the smoker. "These results show what common sense would suggest--when you're within a few feet downwind of a smoker, you get exposed," Ott explained. "But likewise, when you go a little distance or stay upwind, the exposure goes way down. If there's just one smoker, and you can sit six feet away, you would have little problem. At the same time, if there are a lot of smokers nearby, you may be exposed to very high levels of secondhand smoke. So this thing that critics have been dismissing as trivial is not."

Added Klepeis: "If people realize that being near outdoor smokers can result in potentially large exposures to toxic air pollution, they may decide they do not wish to be exposed in a variety of outdoor settings. This realization may lead to an increased number of smoking bans in public locations."


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Contact: Mark Shwartz
mshwartz@stanford.edu
650-723-9296
Stanford University
2-May-2007


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