There was soot everywhere from the smoke stacks of the factories. The soot was on the sides of building, sides of tree, and generally just everywhere. So these light colored moths stood out and susceptible to predation. The darker the moth was, the more it blended in with the dark soot covered background and didn't get eaten. A few days ago there was a very dark moth on the white ceiling of the garage and it really stood out.
I took the picture on day one and it was back the next day in a different spot on the white ceiling. Pretty hard for a dark moth to conceal itself on a white background. On day 3 it was back again but on the window.
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