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Let Out the Gas
Open a window. Go for a walk. Even a tiny increase in indoor levels of carbon dioxide gas (CO2)—exhaled by each of us in every breath—impairs decision making, found a study published in Environmental Health Perspectives. Volunteers in a role-playing exercise made moderately worse decisions when CO2 levels were 1,000 ppm (an average crowded room) and dramatically worse ones at 2,500 ppm (a stuffier room in which we might smell others), while outdoor levels are about 350 ppm. Note: The more people in a space, the higher the CO2, which casts some doubt on whether we make our best decisions in meeting rooms. (CO2 meters cost $200 or less online.)
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