Mainly because of Smog, Gasses, Smokes, and other dust particle carrying things. They attract water particles which make more frequent clouds. -__-
***EDIT***
I know you'll ask where the smoke and whatnot comes from in urban areas, but urban centers are usually populated because heavy factory work can be found there. Nyeh.
It's so pretty! I like it so much! I wish it was wallpaper sized. Can you make it wallpaper sized? (You don't have to do that for me) Oh but it's so pretty! I have a few unresolved issues with the colour scheme of this site ("dear lord I'm blinded") and I wish THIS was a colour scheme of this site!
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***EDIT***
I know you'll ask where the smoke and whatnot comes from in urban areas, but urban centers are usually populated because heavy factory work can be found there. Nyeh.
And I like it best with the stars... ^__?
As those images would link to the originals and to the editor.
>X<