Grandma may have been right about keeping a teakettle warming on the stove in winter to moisten the air. Studies of seasonal influenza have long found indications that flu spreads better in dry air.

FIGURE 1. Relative indoor humidity (violet) and absolute exterior humidity (orange) displayed over 26 months. For the majority of winter months, rh ranged between 35 and 60 percent. December 10, 2018 ...

Please provide your email address to receive an email when new articles are posted on . Lower levels of indoor absolute humidity correlated with an increased risk for acute respiratory illness, or ARI ...