"pollution 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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#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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#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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#12151126

12 March 2025

A view of the waxing crescent moon is covered with a thick haze of fine dust particles in a country village in Sangju, South Korea, on March 13, 2025. Environmental authorities enforce emergency emission reduction measures in South Korea for the first time this year due to heavy ultrafine dust concentrations.

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#12151127

12 March 2025

A view of the waxing crescent moon is covered with a thick haze of fine dust particles in a country village in Sangju, South Korea, on March 13, 2025. Environmental authorities enforce emergency emission reduction measures in South Korea for the first time this year due to heavy ultrafine dust concentrations.

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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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#11116505

3 April 2024

An aerial view of Kyiv, Ukraine, on April 2, 2024, shows the air quality deteriorating as the increased concentration of fine dust from the Mediterranean accompanies the heat wave.

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#11116506

3 April 2024

An aerial view of Kyiv, Ukraine, on April 2, 2024, shows the air quality deteriorating as the increased concentration of fine dust from the Mediterranean accompanies the heat wave.

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#11116507

3 April 2024

An aerial view of Kyiv, Ukraine, on April 2, 2024, shows the air quality deteriorating as the increased concentration of fine dust from the Mediterranean accompanies the heat wave.

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#11116508

3 April 2024

An aerial view of Kyiv, Ukraine, on April 2, 2024, shows the air quality deteriorating as the increased concentration of fine dust from the Mediterranean accompanies the heat wave.

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