By Sarah Zhang

Energy-efficient buildings can be wonderful at keeping out drafts and keeping down heating bills. But the same air-tightness, unfortunately, is also perfect for trapping humid air where toxic mold can go to party.

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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/bIvpEXGIXVI/an-unintended-effect-of-energy-efficient-buildings-tox-1522961068