Pollutants

Pollutants are generally in the form of gasses and particulates. While most pollution enters a building from outside, pollution can also be caused by construction materials, paints, untreated wood, particleboard, and plastics, which emit gases that are harmful to paper. These include sulfur dioxide, carbon monoxide, formaldehyde, and a wide variety of industrial gases. Pollution also occurs in the form of tiny solids, or particulates, such as grit, dust, and smoke. Pollution can be controlled through heating, ventilating, and air cooling (HVAC) systems. HVAC systems filter incoming air to remove particulates and gasses.