"world's most polluted cities"

#12450258

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Jean-Drapeau Park with the Biosphere, obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450247

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's harbour area obscured by travelling wildfire smoke, seen from Longueuil Marina, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450251

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Jacques Cartier Bridge area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450256

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Jacques Cartier Bridge area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450257

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's harbour area obscured by travelling wildfire smoke, seen from Longueuil Marina, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450248

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of traffic on Road 132 with downtown Montreal obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450249

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of a deserted Longueuil festive zone area, obscured by travelling wildfire smoke, in Longueuil, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450250

7 June 2025

MONTREAL, CANADA - JUNE 6: A message (in French) left on a lamp post expresses concern about air pollution and climat change events, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450243

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's harbour area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450244

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's harbour area with Olympic Stadium in the background, obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450245

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's harbour area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450246

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Jacques Cartier Bridge area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12450242

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Jacques Cartier Bridge area obscured by travelling wildfire smoke, in Montreal, Quebec, Canada, on June 6, 2025. As hundreds of wildfires rage across Canada, drifting smoke has triggered emergency evacuations, power outages, and air quality alerts in Ontario, Quebec, and parts of the U.S., with Montreal ranking as the second most polluted city in the world on June 6, ahead of Delhi and Santiago, and Toronto placing fourth, according to IQAir.

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#12256360

12 April 2025

The Kathmandu Valley has a cleaner appearance after heavy winds and rainfall sweep away the pollution from the atmosphere, as seen from a hill station on the outskirts of Kathmandu, Nepal, on April 12, 2025. The bowl-shaped valley remains among the world's most polluted cities as dust accumulates in the valley, lowering the Air Quality Index (AQI) of the capital.

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#12256362

12 April 2025

The Kathmandu Valley has a cleaner appearance after heavy winds and rainfall sweep away the pollution from the atmosphere, as seen from a hill station on the outskirts of Kathmandu, Nepal, on April 12, 2025. The bowl-shaped valley remains among the world's most polluted cities as dust accumulates in the valley, lowering the Air Quality Index (AQI) of the capital.

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#12256364

12 April 2025

The Kathmandu Valley has a cleaner appearance after heavy winds and rainfall sweep away the pollution from the atmosphere, as seen from a hill station on the outskirts of Kathmandu, Nepal, on April 12, 2025. The bowl-shaped valley remains among the world's most polluted cities as dust accumulates in the valley, lowering the Air Quality Index (AQI) of the capital.

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