If the humidity level is too low it can cause discomfort in the respiratory airways and cause coughing, frequent colds, sore throats and sinusitis amongst other symptoms. The recommended relative humidity level is 40% - 60%.
Warm mist humidification relieves the symptoms of colds and croup and other respiratory congestion
Cool mist humidification adds moisture when the air has become too dry for comfort - reduces static electricity and makes your skin feel more comfortable
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If the humidity level is too low it can cause discomfort in the respiratory airways and cause coughing, frequent colds, sore throats and sinusitis amongst other symptoms. The recommended relative humidity level is 40% - 60%. 
