Take a brief walk outside and you're likely to encounter a wide range of things that could influence your health—the sunlight beaming on your face, a plume of exhaust, or even noise from a car driving by. Each exposure carries with it the possibility of affecting your physical well-being.

Take a brief walk outside and you’re likely to encounter a wide range of things that could influence your health—the sunlight beaming on your face, a plume of exhaust, or even noise from a car driving by. Each exposure carries with it the possibility of affecting your physical well-being.

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