gunpowder smoke
Refers to the smoke produced by gunpowder, often in historical or military contexts.
戦場には硝煙が立ちこめていた。
Gunpowder smoke hung over the battlefield.
Gunpowder smoke was rising here and there across the battlefield.
After firing the gun, the smell of gunpowder smoke lingered in the air.
The whole battlefield was enveloped in gunpowder smoke.