Hanoi Declared World's Most Polluted City, Authorities Seek Action

Residential buildings are shrouded behind heavy air pollution in Hanoi on January 3, 2025. (Photo by Nhac NGUYEN / AFP)
Residential buildings are shrouded behind heavy air pollution in Hanoi on January 3, 2025. (Photo by Nhac NGUYEN / AFP)
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Hanoi Declared World's Most Polluted City, Authorities Seek Action

Residential buildings are shrouded behind heavy air pollution in Hanoi on January 3, 2025. (Photo by Nhac NGUYEN / AFP)
Residential buildings are shrouded behind heavy air pollution in Hanoi on January 3, 2025. (Photo by Nhac NGUYEN / AFP)

Vietnam's capital Hanoi has been covered in thick smog over recent weeks, putting it at the top of a list of the world's most polluted cities, as the government said it would push for more electric vehicles (EVs) to alleviate the problem.
Levels of hazardous small particles, known as PM2.5, were measured at 266 micrograms per cubic meter in Hanoi early on Friday, the highest reading among a list of most-polluted cities, according to AirVisual, which provides independent global air pollution information via a phone app.
The Southeast Asian country, a regional manufacturing hub with one of the fastest-growing economies in Asia, has reported severe air pollution in its major cities for years, particularly in Hanoi, Reuters said.
The thick smog is mostly caused by heavy traffic, trash burning and industrial activities.
"We the elderly can feel it very clearly when we suffer from respiratory problems that lead to breathing difficulties," Luu Minh Duc, a 64-year-old resident of the city, said. "The situation seems to get worse recently."
Young people are also complaining.
"At first I thought it was foggy ... but later I found out that it is actually fine dusts that reduce my vision and make me feel like it is not healthy to breathe," said 21-year-old student Nguyen Ninh Huong.
Speaking at a meeting with the transport ministry on Thursday, Deputy Prime Minister Tran Hong Ha called for an accelerated transition to electric vehicles (EVs) as part of the efforts to reduce pollution, state media reported.
So far Hanoi has a target for at least 50% of buses and 100% of taxis to be EVs by 2030.
"This is the responsibility of the state to the people, and there must be specific and timely actions," Ha was quoted as saying by the Tien Phong newspaper.
The ministries of natural resources, environment and health did not immediately respond to Reuters' requests for comment.



Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
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Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)

For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the largest piece of Mars ever found on Earth.

Sotheby's in New York will be auctioning what's known as NWA 16788 on Wednesday as part of a natural history-themed sale that also includes a juvenile Ceratosaurus dinosaur skeleton that's more than 6 feet (2 meters) tall and nearly 11 feet (3 meters) long, The Associated Press reported.

According to the auction house, the meteorite is believed to have been blown off the surface of Mars by a massive asteroid strike before traveling 140 million miles (225 million kilometers) to Earth, where it crashed into the Sahara. A meteorite hunter found it in Niger in November 2023, Sotheby's says.

The red, brown and gray hunk is about 70% larger than the next largest piece of Mars found on Earth and represents nearly 7% of all the Martian material currently on this planet, Sotheby's says. It measures nearly 15 inches by 11 inches by 6 inches (375 millimeters by 279 millimeters by 152 millimeters).

"This Martian meteorite is the largest piece of Mars we have ever found by a long shot," Cassandra Hatton, vice chairman for science and natural history at Sotheby's, said in an interview. "So it´s more than double the size of what we previously thought was the largest piece of Mars."

It is also a rare find. There are only 400 Martian meteorites out of the more than 77,000 officially recognized meteorites found on Earth, Sotheby's says.

Hatton said a small piece of the red planet remnant was removed and sent to a specialized lab that confirmed it is from Mars. It was compared with the distinct chemical composition of Martian meteorites discovered during the Viking space probe that landed on Mars in 1976, she said.

The examination found that it is an "olivine-microgabbroic shergottite," a type of Martian rock formed from the slow cooling of Martian magma. It has a course-grained texture and contains the minerals pyroxene and olivine, Sotheby's says.

It also has a glassy surface, likely due to the high heat that burned it when it fell through Earth's atmosphere, Hatton said. "So that was their first clue that this wasn't just some big rock on the ground," she said.

The meteorite previously was on exhibit at the Italian Space Agency in Rome. Sotheby's did not disclose the owner.

It's not clear exactly when the meteorite hit Earth, but testing shows it probably happened in recent years, Sotheby's said.

The juvenile Ceratosaurus nasicornis skeleton was found in 1996 near Laramie, Wyoming, at Bone Cabin Quarry, a gold mine for dinosaur bones. Specialists assembled nearly 140 fossil bones with some sculpted materials to recreate the skeleton and mounted it so it's ready to exhibit, Sotheby's says.

The skeleton is believed to be from the late Jurassic period, about 150 million years ago, Sotheby's says. It's auction estimate is $4 million to $6 million.

Ceratosaurus dinosaurs were bipeds with short arms that appear similar to the Tyrannosaurus rex, but smaller. Ceratosaurus dinosaurs could grow up to 25 feet (7.6 meters) long, while the Tyrannosaurs rex could be 40 feet (12 meters) long.

The skeleton was acquired last year by Fossilogic, a Utah-based fossil preparation and mounting company.

Wednesday's auction is part of Sotheby's Geek Week 2025 and features 122 items, including other meteorites, fossils and gem-quality minerals.