To my fellow bike path users: I ride our local bike path daily. Approximately 1 in 4 of you are wearing face masks while riding. As a physician, observing the evolution of this pandemic, it is my opinion that — barring respiratory symptoms like fever, cough or sneezing — it is 100% unnecessary to wear a mask when outside. On the other hand, rebreathing your own carbon dioxide, especially when exercising, is definitely harmful to your health.
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