Black Smoke
noun
Black smoke is black smoke. It's also something you should avoid if you can.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
黒煙が見えると思ったら、あそこのマンションで火事だって！
I thought I saw black smoke, and turns out there's a fire at that apartment building over there!
俺は黒煙をモクモク出して走るディーゼル車が好きなんです。
I like diesel cars that run with a cloud of black smoke.
黒煙を上げながら冬の北海道を走るSLは、とてもカッコよかったです。
The steam locomotive billowing black smoke and running through the winter landscape of Hokkaido was really cool.