I thought it was cloudy yesterday and foggy, too, in Minnesota. But it was actually fire smoke from Canada.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
On Monday, some 449 fires were burning across Canada, including 219 out of control, according to the Canadian Interagency Forest Fire Centre.
"If you look at western Canada, it's completely covered by the smoke and that continues into Tuesday," federal meteorologist Gerald Cheng told reporters on Monday. "The risk for smoke is very high because the winds are really transporting the smoke throughout Alberta today and even into Tuesday."
https://www.reuters.com/world/americas/western-canada-covered-smoke-wildfires-loosen-grip-quebec-2023-06-12/