Extreme heat and smoke from Canadian wildfires are creating additional challenges for farmers and livestock producers across portions of the northern United States. The National Weather Service issued heat advisories and excessive heat warnings for parts of the Upper Midwest, with heat indexes approaching 100 degrees in some locations. At the same time, smoke from wildfires burning in Canada has led to deteriorating air quality across sections of the Midwest and Northeast. Agriculture experts warn prolonged heat can stress corn and soybean crops during critical development stages and increase health risks for livestock and farm workers. Agriculture.com reported that smoky conditions may also hamper outdoor agricultural operations and reduce visibility in some areas. The weather concerns come during a period when much of the U.S. corn crop is entering pollination, one of the most important yield-determining phases of the growing season.