Canadian wildfire smoke again blankets major US regions

Smoke from Canadian wildfires has again spread across large parts of the United States, leaving tens of millions of people under poor air quality alerts. The plume is affecting the Midwest, Mid-Atlantic and Northeast, with major cities including Chicago, Detroit, Baltimore, Washington DC and New York among the places hit. Officials and air quality monitors said the smoke was drifting south and east from fires in Ontario, creating another day of hazardous and very unhealthy conditions.

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The supplied data says about 109 million people are being affected. In Chicago and Detroit, air quality reached hazardous levels, with an air quality index of 361 in Chicago and 281 in Detroit. Baltimore and Washington DC recorded very unhealthy readings of 281 and 247 respectively, while New York City stood at an unhealthy 184.

Philadelphia and Cleveland were also listed at very unhealthy levels, and parts of Michigan, Minnesota and Wisconsin were in the hazardous range. The smoke has prompted public health advice in affected areas, including warnings to stay indoors, reduce activity and keep windows closed. Michigan's environment department recommended limiting the opening of doors and using HVAC systems rated MERV-13 or higher.

It also advised that people who must go outside briefly should consider an N95 or P100 respirator marked by the National Institute for Occupational Safety and Health. The conditions have added to concerns for people with respiratory illness, older adults and others more vulnerable to poor air quality. The episode matters because it shows how wildfire smoke can cross borders and affect densely populated regions far from the fires themselves.

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The impact is not limited to one city or state, but stretches across several major urban areas and multiple states at once. That broad footprint makes the event a public health issue as well as an environmental one, with implications for schools, workplaces, transport and outdoor activity. It also underlines the growing regional reach of wildfire smoke in North America.

The fires are linked to ongoing wildfire activity in Canada, with NASA's Fire Information for Resource Management System showing pockets of fire reaching deep into the Northwest Territories. The supplied material also says there has been a clear intensification in wildfire activity in Canada over the past few weeks, particularly in Ontario. A senior scientist at the Copernicus Atmosphere Monitoring Service said major fires in Ontario were already having severe air quality impacts across the Great Lakes region and the north-eastern United States.

The same source said some cities in the north-east and New England were expected to see relief as stronger winds from Quebec pushed the smoke away. What remains unclear is how long the smoke will continue to affect the most populated areas and how quickly conditions will improve city by city. The forecast in the supplied material suggests the plume will keep moving eastwards, but local air quality will depend on wind patterns and the behaviour of the fires in Canada.

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