Warnings were issued on Wednesday across large swathes of the region, stretching to the eastern coast of the US. Those warnings were issued as far south as Georgia and Alabama, three weeks after haze from the Canadian fires had initially blanketed cities across the US and turned skies orange in some places.
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The worst affected cities on Wednesday were Detroit, Michigan; Minneapolis, Minnesota; and Chicago, Illinois, all of which ranked in the top four cities with the worst air quality in the world, according to IQ AIR, a Swiss air quality technology company and monitor. Toronto, Canada, was ranked sixth on the list.
For its part, the US Environmental Protection Agency (EPA) rated a stretch covering Madison, Wisconsin; Indianapolis, Indiana; and Pittsburgh Pennsylvania, as having “very unhealthy” air – its second most severe rating.
Meanwhile, moderately poor air quality stretched all the way to Florida’s northern edge, according to the EPA’s real time tracker. A patch near Detroit was labeled “hazardous” on Wednesday.
What a difference a day makes! Here's a view of downtown Pittsburgh from this time yesterday vs. this morning.
🚨 An Air Quality Alert remains in effect for western PA through midnight tonight. #pawx
— NWS Pittsburgh (@NWSPittsburgh) June 28, 2023
In Chicago, Mayor Brandon Johnson urged young people, older adults and residents with health issues to spend more time indoors while unsafe conditions continued.
He pledged “swift action to ensure that vulnerable individuals have the resources they need to protect themselves and their families”.
Officials in New York City warned that while the worst air quality was currently in the western reaches of the state, conditions could get increasingly worse.
We’re already seeing unhealthy air quality in Western New York, Central New York and the Eastern Lake Ontario regions.
If you’re heading out for the day, especially if you’re in a vulnerable group, check the latest air quality information and take steps to protect yourself. pic.twitter.com/FZO5Qc6xWW
— Governor Kathy Hochul (@GovKathyHochul) June 28, 2023
“Poor air quality can affect people differently, so individuals must assess their own sensitivities and adjust to conditions at the time,” the New York City Department of Health and Mental Hygiene said in a statement.
While air quality remained moderate in the largest US city on Wednesday, “wind patterns can quickly change without notice”, the department said.
Canada is wrestling with its worst-ever start to the wildfire season, which has already burned 6.5 million hectares (16 million acres) ahead of the hottest months of the year.
Across Canada on Wednesday, 490 fires were burning, and 255 of them were considered to be out of control.
The small particles in wildfire smoke can irritate the eyes, nose and throat and can affect the heart and lungs, making it harder to breathe.
Health officials have said it is important to limit outdoor activities as much as possible to avoid breathing in the particles.
The poor air quality comes as large portions of the US are also contending with extreme heat.
In the Deep South and Southwest of the US, high temperatures combined with high humidity created dangerous conditions. About 56 million people were expected to experience stifling heat throughout the day and into the weekend, the weather service said in its forecast.
At least 11 deaths in West Texas were blamed on heat, The Associated Press news agency reported
Heat indexes – which use humidity and temperature to calculate how hot it feels – were expected to climb to the equivalent of 38C (100F). In some spots, the heat index was forecast to reach 46C (115F), the service said, urging people to stay indoors and drink water.