According to the IQAir air quality index application, at 10am - almost noon, Hanoi was still at the second most polluted level in the world with AQI 288.
In particular, many measuring points reached the brown threshold - the pollution threshold that is harmful to human health. Measuring point Ciputra (Tay Ho) AQI 338, Quang Ba (Tay Ho) AQI 306, Ho Tay Compound AQI 390. In particular, there is 1 polluted point at the extreme threshold, Quang Khanh (Tay Ho) with AQI 425 (this is the index at the brown threshold, close to the extreme threshold in the pollution index table of 500).
In addition, many measuring points also recorded pollution levels at the purple threshold - very harmful to human health. Such as measuring point Dang Thai Mai (Tay Ho) AQI 300, University of Technology Parabol Gate (Hai Ba Trung) AQI 296, Le Duan Street AQI 236, Hoang Quoc Viet AQI 275...
Not only Hanoi, the northern provinces are also in a state of serious air pollution. In Bac Ninh, Bac Giang, Thai Nguyen, many air quality measurement points were recorded as harmful to health. Many measuring points were purple and brown.
This situation is common in some large cities, urban areas, areas with a lot of traffic, construction, industrial and agricultural activities, especially in the Northern Delta provinces and especially in the Hanoi capital area and neighboring provinces. The main reason is that the above activities do not meet the requirements of environmental protection along with the impact of seasonal weather conditions with many unfavorable fluctuations; the difference between day and night in temperature, humidity, wind direction and speed, heat radiation, etc. in the air is very large, affecting the ability to diffuse pollutants in the air, especially PM10 dust and PM2.5 fine dust. The situation of burning waste, burning straw, agricultural by-products in the fields (open burning and scattered burning) still occurs if there are no effective measures to prevent it, increasing air pollution and smog.
The Department of Environmental Pollution Control (Ministry of Natural Resources and Environment) recommends that people regularly monitor air quality to proactively limit the impact caused by air pollution.
