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 is recommended to relieve the symptoms of colds and croup
Cool mist humidification is recommended when extra moisture is needed to alleviate dryness
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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%. 
