Air quality in Hanoi during the week ended December 7 at many automatic monitoring stations tended to improve thanks to better weather conditions, according to the Agency of Environmental Protection (EAP).

Air quality index (AQI) at the monitoring stations. Data: AEP

The agency said that Hanoi’s air quality index (AQI) measured at 10 monitoring stations in the city during the week ranged from 48 to 186.

At monitoring stations such as Trung Yen 3, Kim Lien, Tan Mai, My Dinh and Tay Mo, in the past week, the AQI was better than the previous week. In particular, the AQI at all five stations was mostly at the good level (green) and at the average level (yellow).

At two traffic monitoring points in Minh Khai and Pham Van Dong wards, which usually see heavy traffic, in the week, the AQI at both stations also had some improvement, with 3/7 days at the average level. The highest readings at Minh Khai and Pham Van Dong stations were 186 and 178, respectively.

Percentage of days with air quality at different levels. Source: AEP

At monitoring stations such as Hoan Kiem, Hang Dau and Thanh Cong, this week's AQI was better. For instances, Hoan Kiem station had four days at the average level, three days at the bad level and no day at the very bad level.
It can be seen that air quality and weather conditions during the week are closely correlated. It was mostly dry, less windy, the large difference in day and night temperature was detrimental to the diffusion of pollutants in the air, leading to the AQI hitting the bad level which adversely affects local residents’ health.

The EAP recommends that Hanoi’s residents should follow air quality information where they are living and working before going out to prevent diseases.

Data: AEP. Table: Anh Kiet