On September 15 and 16, the concentration of dust in the air in Hanoi was at a high level. Dust pollution appeared in many areas.
Specifically, the measuring point with the lowest air quality is the Academy of Finance with an AQI of 179. Measuring points in the center of Hanoi such as Hang Trong (Hoan Kiem) is 170, Tran Quang Khai is 160. Other measuring points such as O Cho Dua intersection is 164, Thai Ha (Dong Da) is 155, Nga Tu So is 156.
Traffic and construction are also the reasons why Hanoi's streets are foggy.
According to the AQI index ranking table in Vietnam, AQI index from 100-200 is in the bad group, people with sensitive diseases such as respiratory, cardiovascular should limit going out. If the AQI scale exceeds 300, it is an extremely dangerous level, an urgent health warning, everyone needs to stay indoors, should not go out.
Many studies in Hanoi have shown that the phenomenon of temperature inversion is one of the main causes of the sudden increase in the concentration of pollutants (especially PM 2.5 dust - containing many metal particles that can cause cancer and genetic mutations, and ordinary masks cannot prevent this type of dust). According to experts, if the streets have a lot of dust combined with the temperature inversion, all of this dust will be retained at low levels in the air.
There are many main causes of air pollution in the capital, including: traffic activities, construction, industrial production activities...
Previously, at the 2018 Year-End Conference of the Ministry of Natural Resources and Environment, Mr. Nguyen Duc Chung, Chairman of the Hanoi People's Committee, affirmed that air pollution is a serious environmental problem in the capital.
