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Vietnam asks factories to reduce output as Hanoi chokes with smog

Hanoi's industrial plants are under pressure from authorities to reduce their operation after a week of hazardous and heavy smog in the city.

The Ministry of Health in Vietnam urged earlier this week that power, steel and chemical plant outputs should be reduced when the air-quality index is above 200. The air quality index measures the amount of dangerous small particles, known as PM2.5, in the atmosphere.

AirVisual's app, which offers independent information on global?air quality, says that the AQI reached 243 at midday Thursday. Hanoi is now ranked fourth?on a list of most polluted cities.

According to the app's data, the city topped the list a number of times this week. It also held the top spot in January.

Hanoi, the Southeast Asian nation, which is a manufacturing hub that is rapidly urbanising, has suffered from severe air pollution since years.

Pham Thu Giang (30), a Hanoi resident, said: "My eyes itch, and the smog blanket always blocks my vision." "I wear a mask every day."

Air pollution in the city is primarily caused by transportation, industrial production and construction activities, as well as burning garbage and agricultural residue.

Le Thanh Thuy told the local media that gasoline-powered motorbikes were widely used in Hanoi. They are a major source of air pollution.

From mid-2026, the city will ban gasoline-powered motorbikes within certain downtown areas. The ban will then be gradually expanded to include fossil-fuel powered cars.

Luong Van Toi, 75 years old, said that the current air quality in Hanoi is very dangerous. "I am very tired."

If Hanoi's AQI was converted to actual PM2.5 levels, this week's pollution could be up to 50 times higher than the WHO recommended 5-microgram/cu m limit. (Reporting and writing by Thinh Vu, Editing by David Stanway).

(source: Reuters)