Dr. Mary Rice walks with Michael Howard at a Beth Israel Deaconess HealthCare clinic in Chealsea, Mass, as they test his oxygen levels with the addition of oxygen from a portable tank. He has COPD, a progressive lung disease that can be exacerbated by heat and humidity.

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Dr. Mary Rice walks with Michael Howard at a Beth Israel Deaconess HealthCare clinic in Chealsea, Mass, as they test his oxygen levels with the addition of oxygen from a portable tank. He has COPD, a progressive lung disease that can be exacerbated by heat and humidity.