From the NWS:

With all the wildfire smoke over the area, there stands to be a more dangerous outcome and that would be super fog.

In some river valleys, there may be enough moisture coupled with the smoke to cause super fog and reduce visibility to zero.

Use caution if out traveling this morning.

The attached photo shows I-79 at Mount Morris with visibility down to less than a quarter mile.

From Jeff:

Super Fog observed in Suncrest, Morgantown. WV at 0720 EDT. Visibility is less than 0.1 mile. (See the third photo. Location is 1 mile east of the Mon River in Suncrest.)