Experts have warned local residents against outdoor activities và advised that people should wear masks to lớn protect themselves.

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Weather conditions in recent days, with dry và cold air và a lack of rain và wind, have been blamed for the poor weather in Ha Noi. Air pollution is not new in Hanoi, but remains as pressing an issue as ever.

The Vietnam Environment Administration (VEA), under the Ministry of Natural Resources and Environment, has warned local residents against outdoor activities and advised that people should wear masks khổng lồ protect themselves.


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 Hanoi"s air chất lượng on January 6 remains at a bad cấp độ in different locations. Source: moitruongthudo.vn

The municipal authorities have blamed the low air chất lượng on large-scale construction, large number of private vehicles, intensive industrial activity lượt thích steel & cement production, & coal-fired power plants.

Besides, the northeast monsoon usually arrives in the northern part of Vietnam, including Hanoi, during the transitional period. The phenomenon of temperature inversion with some seasonal breeze makes the northern provinces’ air quality poorer.

Data from automatic air monitoring points in recent days show that air unique in many northern localities of Vietnam, especially in Hanoi, is at an alarming level. The air unique in the capital thành phố has deteriorated, with an index measuring it showing “very bad” or even "unhealthy" levels in many places.

Hanoi"s current low air quality is the result of little air circulation in the atmosphere during the transitional period, the representative added.

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Le Thanh Hai, former deputy head of the Vietnam Meteorological and Hydrological Administration, told VnExpress that Hanoi"s low air chất lượng is the result of little air circulation in the atmosphere during the transitional period.


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 Hanoi"s low air unique is the result of the transitional period. Photo: Kinhtedothi.vn

Temperature inversion also contributed khổng lồ the capital city’s poor air chất lượng as thermal radiation is dispersed from the ground into the atmosphere, which causes fog at low altitude, he noted.

"Air masses in the city remain static instead of spreading in various shapes và sizes," nhị explained the high pollution indexes measured in the air of Hanoi in recent days.

"Air could not rise high by convection, so there was no cloud formation to lớn produce rain & cleanse the atmosphere. There is also no wind to disperse the polluted air," he stressed.

Echoing Hai, Hoang Duong Tung, president of the Vietnam Clean Air Partnership, said temperature inversion at night prevents air from rising up into the atmosphere and confines them at the low altitude, which leads to lớn air pollution.

"In the past, we used to lớn pay less attention khổng lồ the phenomenon of temperature inversion because there was not much dust pollution. Nowadays, air quality is automatically monitored every day, air pollution is obvious & draws people’s attention" Tung said.

"In addition to the main reasons such as heavy congestion, large-scale construction và straw burning, weather patterns during winter also make pollution levels worse than in other seasons."

Hanoi plans lớn ban straw và other waste burning from next year lớn reduce pollution. Vietnam suffers an estimated US$10.8-US$13.2 billion worth of economic losses due to air pollution each year, or equivalent khổng lồ 5% of GDP.