Smoke from hundreds of wildfires in Eastern Canada has led to air-quality alerts across more than a dozen US states, with fine matter in the atmosphere exceeding unhealthy levels. Health authorities have advised residents to limit time outdoors and those with respiratory issues to consider wearing masks. Canada is currently experiencing its worst-ever wildfire season, with blazes in nearly all of its 10 provinces and territories. Over 3.3 million hectares have already burned and more than 120,000 people have been temporarily forced out of their homes.

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