Hm, Peter that is your point of view but, if you try to see more deeply, you will see the dirt on roofs hm...how is that happend? Indeed, you will see the muddy clouds behind roofs, and etc. Every town, every village, even every wood have own chimneyes...very bad. Regards Peter.
Hmm, i was rather looking at the houses in front, which demand more attention than the far away industry, so your point is not well expressed in this photo imho .. Peter