In a survey of more than 50,000 people, every 10 additional decibels of road noise led to an increase of 14 percent in the probability of a stroke when averaged for all age groups.
For those under 65, the risk was not statistically significant. But the risk was weighted hugely in the over-65 group, where it rose 27 percent for each 10 decibel increment.
Above 60 decibels or so, the danger of stroke increased even more, the researchers found.
A busy street can easily generate noise levels of 70 or 80 decibels. By comparison, a lawnmower or a chainsaw gives off 90 or 100 decibels, while a nearby jet plane taking off typically measures 120 decibels.
"Previous studies have linked traffic noise with raised blood pressure and heart attacks," said lead researcher Mette Sorensena of the Danish Cancer Society.
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