I rediscovered this article recently which was written by my mother probably around 20 years ago when her memory was still good. I haven't rewritten it and so I apologise for the typos but I think that you can get the gist of what she is saying. My mother lived in South Yorkshire during WW2 which was, at the time, one of the main industrial areas of the UK.
I remember that we went back to visit in the mid 1970's when there was still some significant industry in the area. I can remember factories belching out large clouds of thick black smoke, with my mother pointing out that it was much cleaner air and less pollution to what there use to be.