Why is Hanoi the most polluted in the world?

Hùng Cường |

Hanoi is regularly on the list of the world's most polluted cities, with air quality indexes at warning levels for many days.

Hùng Cường
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Hanoi is the most polluted in the world, with some spots reaching extreme pollution

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On the morning of January 3, the IQAir application ranked Hanoi as the most polluted city in the world.

The two most polluted times of the day

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During the day, air pollution levels fluctuate, concentrated between 6-8am and 5-7pm.

Hanoi ranked 2nd in the world for pollution, many measuring points at hazardous levels

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Near noon on January 2, Hanoi's sky was still hazy, IQAir ranked Hanoi as the second most polluted city in the world.

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Live broadcast of the Champions League knockout round draw for the 2025-2026 season, taking place at 6:00 PM on January 30th.

Hanoi temporarily bans all vehicles on some streets on January 31st

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Hanoi - The temporary ban on vehicles is to ensure security and traffic safety to serve the "Light Concert - Welcoming the New Year 2026" program.

Mr. Le Minh Tri holds the position of Head of the Central Internal Affairs Commission

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Mr. Le Minh Tri, Member of the Politburo, Secretary of the Party Central Committee, Standing Deputy Head of the Central Internal Affairs Commission, holds the position of Head of the Central Internal Affairs Commission.

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Floating jams and candies of unknown origin circumvent the law and smuggle into the market during Tet

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Hanoi is the most polluted in the world, with some spots reaching extreme pollution

Huy Hùng |

On the morning of January 3, the IQAir application ranked Hanoi as the most polluted city in the world.

The two most polluted times of the day

Huy Hùng |

During the day, air pollution levels fluctuate, concentrated between 6-8am and 5-7pm.

Hanoi ranked 2nd in the world for pollution, many measuring points at hazardous levels

Huy Hùng |

Near noon on January 2, Hanoi's sky was still hazy, IQAir ranked Hanoi as the second most polluted city in the world.