Seeing the picture for this challenge, I’m unsure on how to feel. On one hand, one smokestack has smoke coming out, which is bad. Especially since the other tower has steam coming out. Why I think it’s steam: Nuclear power plants use fission to boil water and make steam to turn turbines. Steam isn’t harmful on its own, but can become dangerous when combined with smoke. Smog is produced, and has been incredibly dangerous in the past, i.e. the great smog of 1952, when smoke from people burning coal fused with water vapor in the air and made smog. 

Image from 100 Word Challenge.