Indoor Air Quality in the winter months is dismal. The Reno Gazette Journal ran a piece recently about reducing irritants that make indoor living uncomfortable.
From Kevin Dick, director of Air Quality Management Division of the Washoe County Health District -
“With the potential for carbon monoxide in homes, it’s a good idea for an annual check up for the furnace and to make sure there is no crack in the heat exchanger,” Dick said “And for particulates, make sure you change the filters in the furnace, maybe using more efficient ones. ”
http://www.rgj.com/article/20110108/LIV/101080306/Reduce-eliminate-irritants-that-can-make-indoor-living-uncomfortable