Great shot hauntedheadnc
Just because there is a tint of color in the sky doe's not mean its smog.
There are natural particles of dust that float in the atmosphere all the time
whether humans are there to cause them or not.... and depending on the
geographic location can determine what level is normal. Arizona and the
south west has much higher level of particles of dust in the air than other
parts of the country because of dry landscape in the region.
Also, photos can be misleading; if you are shooting into the suns direction, a
shot like that can give the impression that it’s smoggy when it's really not.