Monday December 10, 2007, 5:25 pm
If you do choose to use one, make sure you pick the right kind, and buy an instrument called a hygrometer (they cost as little as $10) that measures humidity in the air. Ideally, humidity should not go above about 35 percent.

The ones that use steam or boiled water are less likely to breed mold than the ones that use cool mist, but the hot ones also pose a scalding risk.

Tuesday December 11, 2007, 9:11 am
Add hydrogen peroxide 3% to the water to kill bacteria in the room, in you and in your humidifier/vaporizer. Add a cup of peroxide to a gallon of water.