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• The science behind moving smoking bans outside  

Reflecting on the existing scientific research on second hand smoke exposure outdoors, William Saletan of Slate.com sifts through the most relevant points from two major studies on the subject (the 2006 California Air Resources Board study, and a 2007 study from Stanford). Among the findings: outdoors, second hand smoke levels vary widely and quickly, depend on the individual's distance from a smoker (farther than 6.5 feet or 2 meters, generally reduces exposure to "background" levels), are influenced by how confined the outdoor space is (if there are walls or fences), and the concentration of smokers in a given area. The data, Saletan concludes, point to the need for a measured approach for crafting policy to reduce second hand smoke exposure outdoors. He writes:

"If you want to argue for parkwide smoking bans based on asthma or on an analogy to noise pollution, go ahead and make that case. But let's not cloud that debate by invoking the general harm of secondhand smoke. Studies of secondhand smoke have indeed moved outdoors. Their findings support restrictions on lighting up within a few feet of other people. But they don't warrant more than that."

A new study published in the November issue of the Journal of Occupational and Environmental Hygiene may contribute to the debate. Researchers from the University of Georgia measured second hand smoke exposure among people sitting in the outdoor areas of bars and restaurants where indoor smoking was banned in the city of Athens, Georgia. . . .

generally speaking, hanging out in an outdoor smoking area exposes you to less second hand smoke than being in an indoor, confined space with smokers, and the more space you have between yourself and smokers, the lower levels of exposure you will have. So, this particular study doesn't ring the death knell for outdoor smoking. But, the researchers point out, wielding the official trump card of the public health argument:

Although the increment in cotinine concentrations and, thus, the [second hand smoke] exposure levels were relatively low at the sites of interest, the current view is that there is no level of personal exposure to [second hand smoke] that can be regarded as safe. This study demonstrates the ongoing exposure of nonsmokers to [second hand smoke] outside restaurants and bars, and the limitations of indoor smoking bans alone in protecting the public from exposure to [second hand smoke] outside these establishments.

In other words, the movement to ban smoking in outdoor spaces is here to stay.

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