Indoor air pollution causes headaches, sneezing, fatigue, dry throat, nausea, dizziness and red eyes. It's becoming a bigger problem with each passing day, as homes and offices become more energy-efficient and air-tight to control heat and cold. This practice keeps more pollutants inside -- and the fresh air we need outside. It can build up to levels that are serious health risks. Indoor pollution comes from many sources -- from gas ovens, water heaters and fireplaces. New carpet and some types of furniture and cabinets brought into your home give off carbon monoxide. Fibers, cushions and pressboard release formaldehyde and tobacco smoke. Pesticides and mold, too, come from wet carpets and trapped moisture. The answer is air exchange. Be sure to make provisions for plenty of ventilation and fresh air in your energy planning. Use exhaust fans, air purifiers and that good old standby -- an open window. And that's the On The House tip for today.