Asthma affects over twenty-four million Americans. More than fifty million suffer from allergies. One problem is that as air in your home circulates through the heating and cooling system, pollen, pet dander, dust, smoke, mold and other contaminants settle in the ducts and get sent back into the air you breathe. Fortunately, you can return to breathing clean by getting your ducts professionally cleaned. A certified member of the National Air Duct Cleaners Association can help. Find one nearby via the online directory at n-a-d-c-a--com.