Hanoi air pollution worsened on Wednesday
Air quality monitoring systems in Hanoi have shown an alarming readings since the morning of November 6.
The air quality index over 100 is considered bad and people with respiratory and heart diseases are advised to stay home. If the indexes are from 200 to 300 then everyone is affected and advised to stay indoors.
According to the experts, the pollution may be caused by thermal inversions in winter. Le Thanh Hai, General Secretary of the Vietnam Meteorological and Hydrological Association, said pollutants were trapped by a layer of warm air at 300 to 1,000 metres.
The smog often appears at night and morning and disappears in the afternoon. The experts previously warned that pollution in Vietnam would become more serious in the winter due to heat inversion.
Nguyen Thi Anh Thu, the representative of GreenID, said their data collected in the past three years proved that winter was more polluted than in summer. The most polluted days so far this year was in January when the air quality index was near 300.
The citizens are advised to monitor the situation closely and try to stay indoors when the pollution reaches alarming levels. When it is necessary to go out, they are advised to wear masks to deal with fine dust pollution.
Air quality monitoring systems in Hanoi have shown an alarming readings since November 6
The air quality index over 100 is considered bad and people with respiratory and heart diseases are advised to stay home. If the indexes are from 200 to 300 then everyone is affected and advised to stay indoors.
According to the experts, the pollution may be caused by thermal inversions in winter. Le Thanh Hai, General Secretary of the Vietnam Meteorological and Hydrological Association, said pollutants were trapped by a layer of warm air at 300 to 1,000 metres.
The smog often appears at night and morning and disappears in the afternoon. The experts previously warned that pollution in Vietnam would become more serious in the winter due to heat inversion.
Nguyen Thi Anh Thu, the representative of GreenID, said their data collected in the past three years proved that winter was more polluted than in summer. The most polluted days so far this year was in January when the air quality index was near 300.
The citizens are advised to monitor the situation closely and try to stay indoors when the pollution reaches alarming levels. When it is necessary to go out, they are advised to wear masks to deal with fine dust pollution.
Leave your comment on this story