"world's most polluted cities"

#12992224

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992250

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992266

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992322

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992359

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992362

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992363

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12992368

16 November 2025

Thick smog covers Delhi, India, on July 24, 2024. India's capital, with 18 million residents, has the world's most polluted air with six times the amount of small particulate matter (pm2.5) than what the World Health Organization (WHO) considers safe. The air's hazardous amount of pm2.5 can reach deep into the lungs and enter the blood, causing serious long-term health effects. The WHO declares that India has the world's highest death rate from chronic respiratory diseases. India, home to 13 of the world's top 20 polluted cities, is also the third largest emitter of greenhouse gases behind the United States and China.

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#12450252

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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#12450262

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of traffic on Road 132 with Montreal 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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#12450254

7 June 2025

MONTREAL, CANADA - JUNE 6: Montreal's Concorde Bridge, Victoria Bridge, and Samuel de Champlain Bridge are obscured by travelling wildfire smoke 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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#12450261

7 June 2025

MONTREAL, CANADA - JUNE 6: Montreal's Concorde Bridge, Victoria Bridge, and Samuel de Champlain Bridge are obscured by travelling wildfire smoke 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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#12450253

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Jacques Cartier Bridge 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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#12450260

7 June 2025

MONTREAL, CANADA - JUNE 6: A view of Montreal's Circuit Gilles Villeneuve, 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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#12450259

7 June 2025

MONTREAL, CANADA - JUNE 6: A cyclist wearing a mask rides across Montreal's Jacques Cartier Bridge, surrounded by travelling wildfire smoke, 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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#12450255

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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