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A humidifier is a household appliance or device designed to increase the moisture level in the air within a room or an enclosed space. ... Higher price; Water ...
To eliminate most complaints caused by CO 2, the total indoor CO 2 level should be reduced to a difference of no greater than 700 ppm above outdoor levels. [90] The National Institute for Occupational Safety and Health (NIOSH) considers that indoor air concentrations of carbon dioxide that exceed 1000 ppm are a marker suggesting inadequate ...
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