To provide a vehicular ventilator capable of rapidly determining acceptance/rejection by using thresholds for various kinds of gases contained in the air outside a vehicle, and repeating the determination again according to the sensitivity or the taste of an individual even when acceptance is determined, and the outside air is taken in a cabin. 車両外部の空気に含まれるさまざまなガスに対して、閾値を用いてすばやく良否を判定し、良と判定され、外部空気を車室内に取り込んだ場合においても、個人の感受性または嗜好性に応じて、さらに判定をやり直すことのできる車両用換気装置にする。 - 特許庁