There is something rotten, however, in the state of Denmark (er, Utah), and that is increasing smog as we slowly approach what is known colloquially as inversion season. Here's a view looking west yesterday. The smog is most apparent when the sun is in front of (rather than behind) you. This is a consequence of what is known as forward scattering of the visible radiation. In addition, I suspect the particular matter concentrations are greater in the afternoon over the Great Salt Lake, western Salt Lake Valley, and Tooele Valley because the airmass over the Great Salt Lake this time is often cooler, resulting in less vigorous mixing through a shallower layer.
|Looking west from the BST above North Salt Lake|