2. The ever increasing use of synthetic materials in buildings materials, furniture and carpets provides an ongoing source of airborne volatile organic chemicals (VOC’s), such as off-gassing from carpets and carpet glues, stains, paints, wall coverings and preservatives (formalahyde). About 25% of the adult population can have mild to severe allergic reaction to these VOC’s.
3. Poor design and/or construction of heating, ventilation and air conditioning (HVAC) systems prevents proper air exchanges and poor circulation of conditioned air.
4. Occupant activity, including such everyday activity as cooking, cleaning and laundry; in-home gyms and offices (office equipment can be a source for high levels of dangerous ozone); poor maintenance habits such as forgetting to replace filters or procrastination in the repair of a dripping faucet; and contributing factors such as smoking, burning candles and use of air ‘fresheners’.