It was quickly discovered, however, that cleaning the air was only taking care of a small percentage of the problem of indoor air pollution; the larger percentage of dust and debris in a room "settles" onto surfaces and any movement through that room would stir the dust and contaminants back up and into the air.
It was found out quickly that cleaning the air wasn't enough to solve the issue of indoor air pollution; most of the dust and debris settled onto surfaces, and any movement in the room would cause it to be stirred up again and re-enter the air.