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Study confirms the risk of exposure to secondhand tobacco smoke outdoors

your exposure to secondhand smoke could be the same as if you sat one hour inside a tavern with smokers. Based on our findings, a child in close proximity to adult smokers at a backyard party also could receive substantial exposure to secondhand smoke."

Unlike indoor tobacco smoke, which can persist for hours, the researchers found that outdoor smoke disappears rapidly when a cigarette is extinguished. "Our data also show that if you move about six feet away from an outdoor smoker, your exposure levels are much lower," Klepeis added.

The public has become increasingly concerned about the effects of outdoor smoking, Ott noted. More than 700 state and local governments have passed laws restricting outdoor smoking at playgrounds, building entrances and other public areas, according to the American Nonsmokers' Rights Foundation. Some of the strictest ordinances are in California. The city of Santa Monica, for example, recently banned smoking at parks, beaches, ATM machines, theater lines, open-air restaurants and other outdoor locations.

"Throughout the country, cities and counties are looking at various laws against outdoor smoking, and some of the proposals are pretty drastic," Ott said. "The problem is that until now, there have been virtually no scientific data to justify such restrictions. In fact, our paper is the first study on outdoor smoking to be published in a peer-reviewed scientific journal."

Particulate matter

In the study, the researchers used portable electronic monitors to make precise measurements of toxic airborne particles emitted from cigarettes at 10 sites near the Stanford campus. "We wanted to quantify the potential level of exposure to outdoor tobacco smoke that could occur in everyday settings," Klepeis said. "To do this, we used five different, state-of-the-art instruments to measure secondhand smoke at parks, open-air cafes, sidewalks and outdoor pubs where smokers were present."


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


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