"Dry air" refers to atmospheric or ambient air that does not contain much moisture or water vapor. It is the opposite of humid air, which has a higher amount of moisture. Full definition
This vapour mixes with dry air at the cooling chamber, resulting in the release of warm, moist air to the air in the room. (intelligentmother.com)
In our latitudes a front usually separates warm, moist air from the tropics and cold, relatively dry air from polar regions. (metlink.org)
Overall, will be able to improve your bedroom's humidity levels, and therefore help reduces the chances of your baby getting a sore throat other problems caused by dry air. (pickbabystroller.com)