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The rhinovirus responsible for most common colds is only 0.03 microns in diameter.
January is National Radon Action Month, and according to the EPA more than 8 million U.S. homes have indoor concentrations of radon that exceed safe levels.
Cold weather and the start of the heating season are related to an increase in asthma symptoms.
Secondhand smoke is a dangerous and usually avoidable Indoor Air Quality problem.
Energy-efficient homes require ventilation.
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