Car exhaust and other air pollution, even at levels considered safe by federal regulations, may substantially increase the risk of a stroke, a research team from Beth Israel Deaconess Medical Center has found. After reviewing the medical records of more than 1,700 stroke patients in the Boston area over 10 years, the researchers found a 34 percent increase in the risk of ischemic strokes on days with moderate air quality compared with days when the air was rated good.
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