Abstract: A humidifier for which the cleaning of a water tank is easy includes: a water tank which is mounted inside a housing and stores water; a humidification member which is immersed in the water stored in the water tank and performs humidification; a water container provided with an opening/closing valve which is opened and closed to supply water stored therein to the water tank; a water container support member which is detachably mounted to an upper part of the water tank and on which the water container is seated; and a water supply control member which is mounted to the water container support member and opens and closes the opening/closing valve so that the water can be supplied from the water container to the water tank.

Abstract: A dust sensor apparatus having flow rate control function for securing reliability of measurement of the dust sensor by constantly maintaining flow rate of the air flowing into the dust sensor for measuring concentration of dust in the internal of a vehicle, may include a blow motor configured for controlling flow rate of the air to be packaged in the dust sensor for measuring concentration of dust in the internal of a vehicle such that flow rate of the air flowing into the dust sensor is maintained constantly.