The Speck air quality monitor costs $200, but is available to all through Pittsburgh's public library system. Carnegie Mellon University CREATE Lab hide caption

itoggle caption Carnegie Mellon University CREATE Lab

Cooking on gas and electric stoves can create indoor air pollution. The best way to avoid it is to buy a good range hood that vents outside, experts say. iStockphoto.com hide caption

itoggle caption iStockphoto.com