Denmark: During the sixth annual Copenhagen Light Festival, Danish runners donning lights
The seventh annual Festival of Lights in Copenhagen is being held this year, and thousands of Danes participate in a 7-kilometer marathon while wearing neon and LED lights.
Hanoi chokes as the capital of Vietnam is the most polluted city on the list.
Hanoi, the capital of Vietnam, is the most polluted metropolis in the world. The results were released by the Swiss air quality monitoring company, IQ-Air.
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