粉ふん塵じん

noun

fine dust; particulate dust

Refers to very fine airborne dust, especially mineral or industrial dust such as coal dust, rock dust, or fine particles from crushing or grinding. Often used in technical, safety, or environmental contexts.

• 工こう場じょうでは粉ふん塵じん爆ばく発はつを防ふせぐために換かん気きが重じゅう要ようだ。

  In factories, ventilation is important to prevent dust explosions.

• トンネル工こう事じで粉ふん塵じんが舞まい上あがった。

  Dust flew up during the tunnel construction.