More than 800 wildfires are burning across Canada, sending thick smoke across parts of the United States and prompting hazardous air quality alerts in several states.
The smoke has reduced visibility and forced the cancellation of outdoor activities in cities including Chicago, Pittsburgh and parts of New York, while officials advised residents to remain indoors because of the health risks.
The Canadian Wildland Fire Information System says 858 fires are currently active, with 30 new outbreaks recorded on Thursday. Most of the fires remain out of control.
In northern Ontario, one wildfire forced the evacuation of several First Nations communities, with local leaders reporting extensive damage.
Meanwhile, New York Governor Kathy Hochul says the thick smoke blanketing much of the state has created a serious public health emergency, warning that outdoor conditions are unsafe in many areas.
Authorities have activated emergency air quality measures, including the opening of cooling centres and the distribution of KN95 face masks.
BBC/Maxwell Oyekunle
Follow us on Telegram and YouTube, and join our WhatsApp Update Group for more updates.
