What exactly makes indoor air polluted you might ask? First of all, 25% of outdoor pollution can get indoors without us realizing it. Every time a door or window opens, pollutants get in; not to mention hidden cracks, holes or openings you are not aware of at your home. Then there are contaminants such as dust, mold, pet dander, carbon monoxide and VOCs (Volatile Organic Compounds commonly found in couches) already lurking indoors. Even your shoes can carry germs.
Take a look at this infographic so you are better informed of the risks of indoor air pollution towards your health.

Infographic by: filterbuy.com