As wildfire smoke threatens the World Cup final, more trouble may be brewing in the Pacific Northwest

Dense smoke blanketed skylines for a third consecutive day on Friday, once again sending air quality plummeting to dangerous levels across the Midwest and Northeast. The smoke, from hundreds of wildfires in Canada and Minnesota, took hold in recent days as a heat dome also settled over the same regions, making for a double whammy that could impact public health and World Cup festivities this weekend.

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