More than 100 million in the US are under air quality alerts as Canadian wildfires continue emitting dangerous smoke

More than 100 million people were under air quality alerts early Friday from Wisconsin to Vermont and down to North Carolina as smoke from Canadian wildfires continues to waft south, though conditions are expected to improve slowly into the holiday weekend.

source https://www.cnn.com/2023/06/30/weather/canada-wildfire-smoke-great-lakes-friday/index.html