The Air Quality Index (AQI) ranges from 0 to 500, with smaller values indicating cleaner air and any readings above 300 being hazardous.
Nearly 137 million Americans from the West to the Northeast are under air quality alerts as smoke from wildfires burning in Canada continues to billow into the northern US.
But with the wildfire smoke pushing east, “unhealthy” levels have also been reported in parts of Iowa, Illinois, Indiana, Kentucky, Ohio, Pennsylvania and New York. The entire state of Iowa is included, though forecasters say conditions there should improve throughout the day.
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Canadian wildfire smoke again puts Northeast Ohio on air-quality alertOhio is one of 20 states under air-quality advisories because of smoke from Canadian wildfires.
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Canada wildfire smoke returns to Northeast OhioNortheast Ohio residents may notice a slight haze on Sunday as the Canada wildfires continue to burn, sending smoke to the region.
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US heatwave: high temperatures forecast, northeast braces for rainNearly a quarter of the population in the U.S. is under warnings for extreme heat on Sunday, while an already rain-soaked New England braces for more downpours, the National Weather Service (NWS) said.
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