You must not cause or allow emissions of dark smoke from your site.

The sky to the south was stained by the dark smoke.

Dark purple smoke emerged from his mouth with the words.

He broke off and turned around as a fresh wave of dark smoke rolled in from the suddenly opened after door.

You must not burn waste material that produces dark smoke.

This material was sensitive to water, and evolved lots of dark smoke.

I saw movement on the ground north of the dark gray smoke where my rocket impacted.

His gloomy observation hung in the air like dark smoke.

It burst into flame, and a moment later there was a small but growing cloud of dark smoke.

When firefighters arrived, they found the first floor filled with heavy, dark smoke, and the front windows broken.