Walking on the carpet orarea rugscrushes the pollutants deep into carpet and area rugfibers which makes them unreachable by vacuums and often overlooked by professional cleaners. If left untreated, the small particles attract Dust Mites which are microscopic bugs that leave behind daily waste and feces of up to 200 times their body weight. Even though the original pollutants are embedded tight in the fibers of your carpet, body parts and "left overs" from the dust mites can easily be inhaled when the area is disturbed.
Do you smell that too? What is that smell?