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A dense fog advisory remains in effect for all of East Central Illinois until 9 a.m. Wednesday.

The advisory impacts Champaign, Coles, DeWitt, Douglas, Edgar, Ford, Iroquois, Macon, Moultrie, Piatt, Shelby, and Vermilion counties.

Visibility is less than a quarter of a mile in some places. If you're driving, slow down and turn on your headlights.