I spent a week in Houston, Texas, lately. After two hot and rainy days the sun came out and we saw a bright blue sky. I was impressed by this building which really tried to reach the sky. I took the photo from the 22d floor of our hotel. No idea what the exact height is and how many floors there are in it.
This picture was also taken from the same floor in the opposite direction. It clearly shows the pollution at the horizon. Funny you can't see the smog right above you.