"layer"

#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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#13220679

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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#13220680

20 January 2026

KRAKOW, POLAND, JANUARY 20: People walk 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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#13220683

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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#13220695

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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#13220696

20 January 2026

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

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#13220697

20 January 2026

KRAKOW, POLAND, JANUARY 20: View of the tram trucks 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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#13220704

20 January 2026

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

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#13220706

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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#13220715

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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#13220716

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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#13220676

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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#13220681

20 January 2026

KRAKOW, POLAND, JANUARY 20: A food delivery worker from Glovo waiting for an order 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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#13220682

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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#13220684

20 January 2026

KRAKOW, POLAND, JANUARY 20: A food delivery worker from Uber Eats rides a bicycle across a bridge 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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#13220707

20 January 2026

KRAKOW, POLAND, JANUARY 20: A person looks at the shop window 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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