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For over a hundred years, there have been efforts to figure out the proper amount of fresh air that needs to be brought into a building. Beginning around the time of the energy crisis in the late 1970s, we did our best to tighten our building envelopes and reduce ventilation rates in an effort to conserve energy. The goal for our homes and offices and schools was to make them less leaky. But maybe we should've consulted some health scientists along the way.
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