That's not fog rolling in at sunset, but rather the smoke from the Chimney Tops wild fire. You can see the smoke rising out of the top in the distance as it fills the Newfound Gap.

Camera: Nikon D7000
Lens: Nikkor 18-55
Tripod:Manfrotto
Filter: CPL
Shutter Release: Nikon
Focal Length: 24 mm
Shutter Speed: 25/1 sec
Aperture: f/10
ISO: 100