Harvard Heart Letter

Walking for fitness? Avoid traffic-clogged streets

Research we’re watching If you walk on busy city streets, breathing the traffic fumes may cancel out the health benefits of the exercise, a new study suggests. The London-based study, published online Dec. 5, 2017, by The Lancet, included 119 volunteers over the age of 60 who were either healthy or had stable chronic obstructive pulmonary disease or stable heart disease. They all walked for two hours midday at two different locations. One…

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