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Embers smolder inside an olive tree during a wildfire in the Rethymno region on the southern Greek island of Crete, Wednesday, July 29, 2026, where two firefighters died while battling the blaze. (AP Photo/Giannis Angelakis)

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Flames burn an olive tree during a wildfire in the Rethymno region on the southern Greek island of Crete, Wednesday, July 29, 2026, where two firefighters died while battling the blaze. (AP Photo/Giannis Angelakis)

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FILE - Visitors return to Stephen C. Foster State Park after an overnight camping trip on the Red Trail in the Okefenokee National Wildlife Refuge in Fargo, Ga., April 6, 2022. (AP Photo/Stephen B. Morton, File)

Heavy smoke from several large wildfires blazing in Canada and Minnesota is expected to engulf large swaths of the Midwest and Northeast U.S. this week, exposing millions of people to dangerous air pollution. Minnesota officials issued an air quality alert from Tuesday through Friday for areas including the Twin Cities metro area, Alexandria and Two Harbors, with very heavy smoke expected across the Arrowhead as large wildfires continued to spread. Officials in Michigan and New York also issued air quality warnings.

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Visitors walk past a grass checkerboard on a sand dune that is part of desertification control efforts at the Engebei Ecological Area near Ordos in northern China's Inner Mongolia province on Friday, June 12, 2026. (AP Photo/Ng Han Guan)

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Men stand on top of a sand dune covered by a grass checkerboard that is part of desertification control efforts at the Engebei Ecological Area near Ordos in northern China's Inner Mongolia province on Friday, June 12, 2026. (AP Photo/Ng Han Guan)

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Yin Yuzhen, a sand-control worker, holds up a plant that did not survive because it was not planted deep enough while at a desertification control site at the Engebei Ecological Area near Ordos in northern China's Inner Mongolia province on Friday, June 12, 2026. (AP Photo/Ng Han Guan)

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Desert control worker Yin Yuzhen walks along sand dunes covered by grass checkerboard that's part of desertification control efforts at the Engebei Ecological Area near Ordos in northern China's Inner Mongolia province on Friday, June 12, 2026. (AP Photo/Ng Han Guan)

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FILE - A drought-stressed stalk of wheat lies on a parched field May 16, 2026, near Macksville, Kan. (AP Photo/Charlie Riedel, File)