Perhaps some of the above mentioned solutions can be tried as a means of eliminating problems. More complicated and less clearly defined issues may require the services of a certified industrial hygienist or consulting group specializing in IAQ matters. Tim Ryan, Ph.D., CIH, CSP, RBP, is assistant professor at the School of Health Sciences at Ohio University in Athens, Ohio, where he teaches industrial hygiene and environmental health. Sources of contamination exist both inside and outside the building. Indoor air pollution can also be caused by leftover food and drink - all of which can harbor bacteria.
Indoor plants can also cause problems.
While live plants help clean the air by absorbing contaminates, dead or dying plants sometimes shed microscopic particles that cause allergic reactions. Water, too, is a potential source of trouble. Water damage on floors, ceilings or walls indicates that standing water is nearby - a perfect breeding ground for bacteria. And, if it is near a ventilation shaft, these bacteria can be drawn into the building's air supply. Have certified technicians make regular inspections of these systems in your facility.