酸さん欠けつ空くう気き

noun

oxygen-deficient air

Technical term for air with low oxygen content, often used in safety contexts.

• 酸さん欠けつ空くう気きが発はっ生せいしやすい場ば所しょでは、換かん気きを十じゅう分ぶんに行おこなってください。

  In places where oxygen-deficient air is likely to occur, please ventilate thoroughly.