"winter pollution layer"

#13228871

22 January 2026

KRAKOW, POLAND – JANUARY 22: An information board displays very high PM10 air pollution levels, showing a reading of 144, in the center of Krakow, Poland, on January 22, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels, varying by location across the city, with some areas recording AQI readings above 190 and other monitoring stations reporting values between 150 and over 200, ranking Krakow again among the world’s most polluted cities on the date.

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#13228879

22 January 2026

KRAKOW, POLAND – JANUARY 22: An information board displays very high PM10 air pollution levels, showing a reading of 144, in the center of Krakow, Poland, on January 22, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels, varying by location across the city, with some areas recording AQI readings above 190 and other monitoring stations reporting values between 150 and over 200, ranking Krakow again among the world’s most polluted cities on the date.

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#13228888

22 January 2026

KRAKOW, POLAND – JANUARY 22: An information board displays very high PM10 air pollution levels, showing a reading of 144, in the center of Krakow, Poland, on January 22, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels, varying by location across the city, with some areas recording AQI readings above 190 and other monitoring stations reporting values between 150 and over 200, ranking Krakow again among the world’s most polluted cities on the date.

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#13220693

20 January 2026

KRAKOW, POLAND, JANUARY 20: View of Krakow's suburban district skyline obscured by heavy air pollution, seen from Krakus Mound, during very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220722

20 January 2026

KRAKOW, POLAND, JANUARY 20: The city of Krakow introduced free public transport as air pollution exceeded safety limits, during very high levels of PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220689

20 January 2026

KRAKOW, POLAND, JANUARY 20: A view over Krakow seen from Krakus Mound, during a very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220690

20 January 2026

KRAKOW, POLAND, JANUARY 20: View of Krakow's suburban district skyline obscured by heavy air pollution, seen from Krakus Mound, during very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220691

20 January 2026

KRAKOW, POLAND, JANUARY 20: A view over Krakow seen from Krakus Mound, during a very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220692

20 January 2026

KRAKOW, POLAND, JANUARY 20: A view over Krakow seen from Krakus Mound, during a very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220701

20 January 2026

KRAKOW, POLAND, JANUARY 20: An information board displays high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220702

20 January 2026

KRAKOW, POLAND, JANUARY 20: A view over Krakow seen from Krakus Mound, during a very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220719

20 January 2026

KRAKOW, POLAND, JANUARY 20: View of Krakow's suburban district skyline obscured by heavy air pollution, seen from Krakus Mound, during very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220720

20 January 2026

KRAKOW, POLAND, JANUARY 20: A view over Krakow seen from Krakus Mound, during a very high levels of PM2.5 and PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220675

20 January 2026

KRAKOW, POLAND, JANUARY 20: Significant traffic moves amid very high levels of PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220677

20 January 2026

KRAKOW, POLAND, JANUARY 20: Street in central Krakow during very high levels of PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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#13220678

20 January 2026

KRAKOW, POLAND, JANUARY 20: Significant traffic moves amid very high levels of PM10 air pollution in Krakow, Poland, on January 20, 2026. A thick layer of smog persisted throughout the day as air quality indicators reached 'Very Unhealthy' levels (AQI over 200), ranking the city among the world's most polluted for the date.

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