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The smog is expected to spread beyond New York to other East Coast areas on Thursday.
With toxic air quality in parts of North America likely to persist, here's what you can do to stay safe.
Smoke from wildfires has enveloped Toronto and New York. We look at the role of a changing climate.
Catastrophic floods engulf towns and villages in southern Ukraine after a major dam was destroyed.
Satellite images reveal the full extent of the devastation caused by the collapse of the Kakhovka dam.
The actress left the stage saying she had trouble breathing due to poor air caused by Canada fires.
People were thrown to the floor and others tried to escape over the sides of the escalator.
Lily Naing Kyaw championed the military - her death has spread fear among its supporters.
Scott Johnson's body was found at the base of cliffs amid a spate of attacks on gay men.
Displays of the symbols will be punishable by jail terms, amid a resurgence in far-right activity.
Men desperate to avoid serving in the army are crossing the mountainous Romanian border to escape.
A 10m humpback whale has been rescued after becoming entangled in a shark net off Australia’s Gold Coast.
Donald Trump's two-time running mate offers his most forceful repudiation of his ex-boss to date.
Some Khartoum residents have become accidental undertakers to stop corpses being left on the streets.
The long-term consequences for agriculture will be severe in one of Ukraine's most fertile areas.
US-based Eat Just says its product is ethical, clean and green but scientists say it may just be a novelty.
Rutvij failed to get into an elite Ivy League university. Was he a victim of discrimination?
Supplies are delivered to those trapped by floodwaters in Russian-controlled areas of the Kherson region.
The volcano has erupted spewing massive flows of lava around the crater floor.
Timelapse video of the city's skyline shows the air quality worsen in a matter of a few hours.
The BBC's James Waterhouse witnesses an evacuation in the Ukrainian city of Kherson.
Kathleen Folbigg was convicted of killing her four infant children in a stunning miscarriage of justice.
Many are trapped in their homes downstream from the breached dam and water levels are still rising.
The BBC's James Waterhouse reports from a town flooded by the recent dam breach.
CCTV footage captured the moment a would-be thief was stopped in his tracks at an Australian liquor store.
The uninvited guest managed to open the door of the vehicle and went in it to get dog food left inside.
The BBC’s analysis editor looks at what we know about the Ukraine dam collapse at Nova Kakhovka.
Russia and Ukraine are pointing the finger at one another, but where does the truth lie?
The city was flooded after Ukraine accused Russia of destroying a huge dam nearby.
President Zelensky shared a video of the Kakhovka dam, in Kherson region, on his Telegram page.