Wisconsin residents are reporting that they smell smoke.
The smoke is from a growing wildfire in the Boundary Waters Canoe Area in Minnesota, according to the National Weather Service office in Green Bay.
Northwest winds in the wake of a cold front Tuesday carried smoke as far into Wisconsin as Green Bay and Milwaukee.
The elderly, children and those with respiratory or cardiac problems are advised to be cautious and avoid going outdoors for prolonged periods of time.
Weather officials said some residents of north central Wisconsin have reported difficulty with breathing, irritated eyes and headaches as a result of the smoke.
Air quality in north central and northeast Wisconsin will likely remain unhealthy over the next few days, according to the National Weather Service.
The U.S. Forest Service said the Pagami Creek forest fire near Ely, Minn., which started on Aug. 18, has more than tripled in size since Sunday and has grown to more than 60,000 acres.