"PM2.5 concentration"

#12871970

17 October 2025

A portion of Kathmandu, Nepal, is covered by a thin layer of smog that shrouds the atmosphere of the bowl-shaped Kathmandu Valley on October 17, 2025, with the Air Quality Index measuring above 100. The average readings of Kathmandu's pollution exceed the annual average concentrations of PM2.5 of 5 ug/m3, while 24-hour average exposures should not exceed 15 ug/m3 more than 3-4 days per year, as prescribed by the World Health Organization. PM2.5 refers to particulate matter (solid or liquid droplets) in the air less than 2.5 micrometres in diameter. It is among the most dangerous pollutants that can get past the nose and throat to penetrate the lungs and even the bloodstream. PM2.5 particles are small and are also likely to stay suspended in the air for long, increasing the chances of people inhaling them. According to Nepal's Environmental Protection Agency's air quality index, an air quality reading of 151-200 is considered unhealthy, causing everyone to experience problems and sensitive groups to feel more severe effects. When air quality reaches 201-300, it is considered a very unhealthy level, and health risks increase for everyone in the area. When it crosses 300, it becomes hazardous, meaning that the air is of extremely poor quality and poses serious health risks to everyone.

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#12871975

17 October 2025

A portion of Kathmandu, Nepal, is covered by a thin layer of smog that shrouds the atmosphere of the bowl-shaped Kathmandu Valley on October 17, 2025, with the Air Quality Index measuring above 100. The average readings of Kathmandu's pollution exceed the annual average concentrations of PM2.5 of 5 ug/m3, while 24-hour average exposures should not exceed 15 ug/m3 more than 3-4 days per year, as prescribed by the World Health Organization. PM2.5 refers to particulate matter (solid or liquid droplets) in the air less than 2.5 micrometres in diameter. It is among the most dangerous pollutants that can get past the nose and throat to penetrate the lungs and even the bloodstream. PM2.5 particles are small and are also likely to stay suspended in the air for long, increasing the chances of people inhaling them. According to Nepal's Environmental Protection Agency's air quality index, an air quality reading of 151-200 is considered unhealthy, causing everyone to experience problems and sensitive groups to feel more severe effects. When air quality reaches 201-300, it is considered a very unhealthy level, and health risks increase for everyone in the area. When it crosses 300, it becomes hazardous, meaning that the air is of extremely poor quality and poses serious health risks to everyone.

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#12871973

17 October 2025

Smoke billows from a residential area in Kathmandu, Nepal, on October 17, 2025, as a thin layer of smog shrouds the atmosphere of the bowl-shaped valley, with the Air Quality Index measuring above 100. The average readings of Kathmandu's pollution exceed annual average concentrations of PM2.5 of 5 ug/m3, while 24-hour average exposures should not exceed 15 ug/m3 more than 3-4 days per year, as prescribed by the World Health Organization. PM2.5 refers to particulate matter (solid or liquid droplets) in the air less than 2.5 micrometres in diameter. It is among the most dangerous pollutants that can get past the nose and throat to penetrate the lungs and even the bloodstream. PM2.5 particles are small and are also likely to stay suspended in the air for long, increasing the chances of people inhaling them. According to Nepal's Environmental Protection Agency's air quality index, an air quality reading of 151-200 is considered unhealthy, causing everyone to experience problems and sensitive groups to feel more severe effects. When air quality reaches 201-300, it is considered a very unhealthy level, and health risks increase for everyone in the area. When it crosses 300, it becomes hazardous, meaning that the air is of extremely poor quality and poses serious health risks to everyone.

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#12871974

17 October 2025

Smoke billows from a residential area in Kathmandu, Nepal, on October 17, 2025, as a thin layer of smog shrouds the atmosphere of the bowl-shaped valley, with the Air Quality Index measuring above 100. The average readings of Kathmandu's pollution exceed annual average concentrations of PM2.5 of 5 ug/m3, while 24-hour average exposures should not exceed 15 ug/m3 more than 3 to 4 days per year, as prescribed by the World Health Organization. PM2.5 refers to particulate matter (solid or liquid droplets) in the air less than 2.5 micrometres in diameter. It is among the most dangerous pollutants that can get past the nose and throat to penetrate the lungs and even the bloodstream. PM2.5 particles are small and are also likely to stay suspended in the air for long, increasing the chances of people inhaling them. According to Nepal's Environmental Protection Agency's air quality index, an air quality reading of 151-200 is considered unhealthy, causing everyone to experience problems and sensitive groups to feel more severe effects. When air quality reaches 201-300, it is considered a very unhealthy level, and health risks increase for everyone in the area. When it crosses 300, it becomes hazardous, meaning that the air is of extremely poor quality and poses serious health risks to everyone.

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#11969915

21 January 2025

Panoramic view of northern port of Krakow, Poland where local air pollution measuring station report PM2.5 exceeded three times and advise people not to leave their homes on January 21, 2025.

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#11969916

21 January 2025

Panoramic view of northern port of Krakow, Poland where local air pollution measuring station report PM2.5 exceeded three times and advise people not to leave their homes on January 21, 2025.

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#11969914

21 January 2025

Panoramic view of northern port of Krakow, Poland where local air pollution measuring station report PM2.5 exceeded three times and advise people not to leave their homes on January 21, 2025.

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#11944487

14 January 2025

Heavy air pollution from fine particulate matter (PM2.5) shrouds a street in Bangkok, Thailand, on January 14, 2025. Thai authorities advise the public to use face masks and avoid outdoor activities due to high air particle pollution from fine particulates (PM2.5).

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#11944488

14 January 2025

Heavy air pollution from fine particulate matter (PM2.5) shrouds a street in Bangkok, Thailand, on January 14, 2025. Thai authorities advise the public to use face masks and avoid outdoor activities due to high air particle pollution from fine particulates (PM2.5).

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#11944491

14 January 2025

Heavy air pollution from fine particulate matter (PM2.5) shrouds a street in Bangkok, Thailand, on January 14, 2025. Thai authorities advise the public to use face masks and avoid outdoor activities due to high air particle pollution from fine particulates (PM2.5).

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#10904476

11 January 2024

Arial view from a plane of air pollution haze over Krakow and its suburbs as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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#10904477

11 January 2024

Arial view from a plane of air pollution haze over Krakow and its suburbs as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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#10904460

11 January 2024

Arial view from a plane of a power station and air pollution haze over Krakow and its suburbs as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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#10904462

11 January 2024

Arial view from a plane of a power station and air pollution haze over Krakow and its suburbs as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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#10904474

11 January 2024

Arial view from a plane of a forest covered with snow in s as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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#10904475

11 January 2024

Arial view from a plane window of air pollution haze over Krakow and its suburbs as temperatures dropped well below 0 Celsius over last days in Krakow, Poland, 11 January 2024. The air pollution was declared very unhealthy and PM2.5, and PM10 concentration was much higher than the WHO annual air quality guidelines. The pollution is a combination of lack of wind and low temperatures which forced the city and its inhabitants to heat their homes more.

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