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"Alertness"
2,469 professional editorial images found
#13536509
5 Apr 2026
A deer crossing road sign in Bala, Ontario, Canada, on September 29, 2023.
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#13485053
22 Mar 2026
Clouds form over Kathmandu, Nepal, after pre-monsoon rainfall reduces air pollution, as seen from a hill station surrounding the city on March 22, 2026. Air pollution in the country, including the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485054
22 Mar 2026
The Swayambhunath Stupa, a UNESCO World Heritage Site, is seen from a hill station surrounding Kathmandu Valley after pre-monsoon rainfall reduces air pollution on March 22, 2026. Air pollution in the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485055
22 Mar 2026
A general view of the Kathmandu Valley is seen from a hill station after pre-monsoon rainfall reduces air pollution on March 22, 2026. Air pollution in the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485056
22 Mar 2026
A general view of the Kathmandu Valley is seen from a hill station after pre-monsoon rainfall reduces air pollution on March 22, 2026. Air pollution in the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485057
22 Mar 2026
Photographers take photos against the backdrop of Kathmandu Valley as seen from a hill station after pre-monsoon rainfall reduces air pollution, on March 22, 2026. Air pollution in Nepal, including in the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', 51 to 100 'requires alertness', 100 to 150 is 'unhealthy' for people with respiratory and heart diseases, 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485058
22 Mar 2026
Clouds form over Kathmandu, Nepal, after pre-monsoon rainfall reduces air pollution, as seen from a hill station surrounding the city on March 22, 2026. Air pollution in the country, including the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485059
22 Mar 2026
Clouds form over Kathmandu, Nepal, after pre-monsoon rainfall reduces air pollution, as seen from a hill station surrounding the city on March 22, 2026. Air pollution in the country, including the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485060
22 Mar 2026
Clouds form over Kathmandu, Nepal, after pre-monsoon rainfall reduces air pollution, as seen from a hill station surrounding the city on March 22, 2026. Air pollution in the country, including the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485061
22 Mar 2026
Clouds form over Kathmandu, Nepal, after pre-monsoon rainfall reduces air pollution, as seen from a hill station surrounding the city on March 22, 2026. Air pollution in the country, including the capital, Kathmandu, has decreased significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now sharply declined to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485062
22 Mar 2026
A general view of the Kathmandu Valley is seen from a hill station after pre-monsoon rainfall reduces air pollution on March 22, 2026. Air pollution in the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13485063
22 Mar 2026
A domestic aircraft flies in the clear sky above Kathmandu, Nepal, on March 22, 2026, after pre-monsoon rainfall reduces air pollution. The air pollution affecting the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased sharply to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. An AQI of 100 to 150 is 'unhealthy', impacting people with respiratory and heart diseases. It is 'unhealthy for all' if the AQI ranges from 151 to 200, while the 'very unhealthy' stage is 201 to 300, and 'very dangerous' if the AQI is above 300.
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#13485064
22 Mar 2026
A general view of the Kathmandu Valley is seen from a hill station after pre-monsoon rainfall reduces air pollution on March 22, 2026. Air pollution in the country, including the federal capital, Kathmandu, has declined significantly. The Air Quality Index (AQI) previously stood at 178, making Kathmandu the second most polluted city in the world a week ago. The AQI has now decreased to 60. An AQI measurement from 0 to 50 is considered 'good', while 51 to 100 'requires alertness'. Levels from 100 to 150 are 'unhealthy' for people with respiratory and heart diseases. An AQI from 151 to 200 is 'unhealthy for all', 201 to 300 is 'very unhealthy', and above 300 is 'very dangerous'.
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#13282980
7 Feb 2026
Indian security personnel stand alert during a random security check in Srinagar, Jammu and Kashmir, on February 7, 2026.
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#13282982
7 Feb 2026
Indian security personnel stand alert during a random security check in Srinagar, Jammu and Kashmir, on February 7, 2026.
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#13279866
6 Feb 2026
EDMONTON, CANADA - MAY 3: A participant holds a placard reading 'Alberta USA 51st State. Our ONLY Choice for Prosperity' as Alberta sovereigntists and supporters gather outside the Alberta Legislature following the federal election victory of Prime Minister Mark Carney's Liberal government and the tabling of new independence-related legislation by Premier Danielle Smith's UCP government, in Edmonton, Alberta, Canada, on May 3, 2025.
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