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One researcher noted that gases can transform just a few feet from their emission source, meaning that the particles in cars are different than what's outside.

New study looks at health risks of in-car pollution

Rush hour drivers may have more to worry about than just traffic jams, according to a recent study. Measurements made by researchers at Duke, Emory University and the Georgia Institute of Technology showed that car drivers and passengers were twice as exposed to air pollution as someone near the roadside.