Thick smoke from hundreds of active wildfires burning across Canada has spread over large parts of the country and into the United States, prompting air quality warnings and renewed health concerns for millions of residents.
Canadian authorities have issued air quality advisories across several provinces, including Ontario, Manitoba, Saskatchewan and parts of Alberta, as smoke continues to blanket major cities such as Toronto, Ottawa and Winnipeg. The smoke has also drifted south into several U.S. states, reducing visibility and affecting air quality in parts of the Midwest and Northeast.
Environment and Climate Change Canada warned that wildfire smoke contains fine particulate matter that can pose serious health risks, particularly to children, older adults, pregnant women and people with asthma, heart disease or other respiratory conditions. Officials advised residents to remain indoors where possible, keep windows closed and limit strenuous outdoor activities.
The Canadian Interagency Forest Fire Centre said hundreds of wildfires remain active nationwide, with many classified as out of control due to hot, dry and windy conditions. Firefighters, supported by international crews and military personnel, continue efforts to contain the blazes and protect threatened communities.
Health experts warned that even healthy individuals may experience symptoms such as coughing, throat irritation, shortness of breath and eye discomfort after prolonged exposure to the smoke. Authorities have urged residents to monitor official air quality forecasts and seek medical attention if symptoms worsen.
Scientists say climate change is contributing to longer and more intense wildfire seasons by creating hotter temperatures and drier vegetation, increasing the likelihood of large, fast moving fires. The latest smoke event is among several that have affected North America in recent years, highlighting the growing environmental and public health challenges associated with extreme wildfire activity.
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