Sorry Bryan, my post did not explain it well at all. Last night there was a response, referring to doing some PP to your original photo to make it look dreadful.
And so I went ape, and typed a lengthy post about how in my opinion it would not be ethical to modify a poster 'against pollution' by adding fake pollution, or manipulating the picture to be something it was not.
Then I wrote that if anything, there were other places in the area, that do pollute something awful, and might work better for a realistic Press photograph.
But then I went back to the photo, to look at it some more, and re-read your post for the tenth time. I realized you mentioned 'archive', and 'just sharing'. So I found all my 'ranting' unnecessary given the situation, after all you were just sharing the pic and not looking for serious CC or a discourse on ethics.
So a minute after posting my original response, I hit Edit, and changed it to what it reads above.
Again, it was my bad and not yours.
I hope this explains it.