Indoor air pollution is comprised of primarily three sources.

Airborne Particles:
Even though they’re not usually visible with the naked eye, airborne contaminants like dust, pollen, dirt, pet dander, insulation and carpet fibers, are usually the largest of the pollutants. These larger airborne particles can cause hay fever and aggravate many different symptoms of asthma.

Biological Contaminants:
These contaminants typically thrive in warm humid environments. Very small, they can get past the bodies natural filtration systems and get into the lungs. Found in places like bedding, basements and bathrooms, biological contaminants include mold spores, dust mites, viruses, fungi, bacteria, yeasts and algae.

Odors and Gases:
These contaminants can be caused by many sources. Fireplaces, gas ovens, space heaters, water heaters, carpets, garages, pets, cleaning products, furniture, paint, perfumes, pesticides and tobacco smoke are all potential sources. More than a nuisance, some of these contaminants can be dangerous or even deadly. One of the more dangerous of these contaminants is carbon monoxide which can be caused by back drafting heating appliances, poorly maintained fossil fuel heating systems, faulty chimneys, gas cooking appliances, cigarette smoking and idling cars in an attached garage.