Vacuums

Homes built after 1979 have tighter insulation wraps -- trapping smoke, odors and other contaminants indoors.

60 million Americans suffer from allergies and asthma; one of the top five environmental risks to public health. -- American Academy of Allergy, Asthma and Immunology

Air pollution contributes to lung disease, including respiratory tract infections, asthma and lung cancer. Lung disease claims close to 335,000 lives in America every year and is the third leading cause of death in the United States. Over the past decade, the death rate for lung disease has risen faster than for almost any other major disease. -- American Lung Association