C88 miasma

My senior brother paused and took a deep breath. Maybe he's inhaled too much. He coughed twice, frowned, and said, No, this is miasma.

The miasma was the poisonous gas produced by the rotting plants and animals in the old forest. If one inhaled too much, it might end up taking one's life. There were many so-called Death Valley places where people, livestock, and the like could not leave