Where oh where did the blue sky go???

For the past few weeks the air quality has been the worst I have ever seen. In fact, a couple of days ago Utah was rated as having the dirtiest air in the nation. Today I couldn't stand it anymore and had to go for a drive up on the Farmington bench just so I could see some blue sky for a few minutes.

The first picture shows the smog we have been living under, the second picture shows that blue sky still really does exist if you can get up high enough.