EPA studies show that even in the smoggiest cities, the air inside most modern homes is usually at least ten times more polluted than the air outside.
How can this be? There are many reasons, some of which were discovered only recently. They include radon and CO2, as well as gas-emitting chemicals. There are also common airborne pollutants such as pollen, viruses, dust and dust mites and damp areas where standing water can breed mold, mildew and other microbes.
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Much of this problem is attributed to the way modern homes are built—for purposes of energy efficiency, and to be as air-tight as possible. The consequence is that stale air, laced with odors, chemicals, irritants often becomes trapped in modern homes, where it circulates over and over.
