Using a Humidifier
A humid environment helps to keep the nasal passage moist, thereby relieving nasal congestion [3] and allowing the sinuses to drain properly. Humidifiers can replace the moisture lost due to air conditioning and central heating in homes and offices.
It is important that one cleans their humidifier every day to prevent the growth of mold and bacteria, both of which can be harmful to one’s health. Ideal indoor humidity ranges from 30-50 percent, depending on the room temperature.
It is important to note that higher levels of humidity can promote the growth of dust mites and other allergens that may make symptoms worse. You can make use of a hygrometer (a device that measures relative humidity) to help decide when to use a humidifier.