Bacteria, mold, dust mites, and volatile organic compounds get trapped in your home. They circulate through duct work and can affect your health. The filter in your furnace does not clean or purify your air. It simply keeps the furnace running. Second hand smoke can affect the health of everyone in your home.
Good ventilation is critical.
Since 1970, homes have been built much tighter. This can cause volatile organic compounds from chemicals used in building materials to be trapped in your home and affect your indoor air quality. These compounds can make you feel ill, and cause harmful effects.