酸欠の資格ってこれかな？？こんな資格もあるのね。
酸素欠乏危険作業主任者 - Wikipedia https://ja.wikipedia.org/wiki/%E9%85%B8%E7%B4%A0%E6%AC%A0%E4%B9%8F%E5%8D%B1%E9%99%BA%E4%BD%9C%E6%A5%AD%E4%B8%BB%E4%BB%BB%E8%80%85
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