Gyms showed high levels of airborne dust, formaldehyde and carbon dioxide, all of which can pose problems for energetic, heavy-breathing exercisers.
from Well http://well.blogs.nytimes.com/2014/11/05/the-bad-air-in-our-gyms/
from Well http://well.blogs.nytimes.com/2014/11/05/the-bad-air-in-our-gyms/
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