The one way that smog is beneficial to scientific observation

This is Berlin at night, and if you look at the horizon line, you'll notice that it's a gray-brown smudge of cloud instead of a line of ground. The lights from the city, and a heavy layer of smog, let us see the planetary boundary layer. It's why planes have a rough time flying low, and why we occasionally need spareā€¦ » 2/07/13 12:20pm 2/07/13 12:20pm