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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