The problem of dry air occurs when the content of water vapor in the air drops down. This is a very common phenomenon in autumn and winter, because the higher the temperature, the higher the humidity. The cold winter air is refreshing and bacteria-free but, unfortunately, it causes dehydration of the skin, drying of the nose and eyes.
A simple way to solve this problem is to hang wet towels on the radiators: when they dry, steam evaporates and humidifies the air. However, the wraps have to be replaced frequently, so it is quite a nuisance. You can also invest in electronic air humidification: it costs from from $10 to $1000. However, you must remember to clean it regularily and replace filters. It is also important that the room temperature does not exceed 21 ° - in humid and warm air bacteria grows rapidly.
Jane