On July 11, the Hanoi’s Environment Protection Authority said that the air quality index at the monitoring station improved more than that on July 10.
A green corner of Hanoi from above
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The air quality measured at monitoring stations around the city reached levels of ‘good’ and ‘average’. Significantly, the number of days with ‘good’ air quality rose in comparison with the previous week.
Mai Trong Thai, the authority head, added that the measured air quality index (AQI) fluctuated between 40 to 94 points which were equivalent to ‘average’ and ‘good’ levels. There was no day with air quality dropping to ‘bad’ level.
Urban air monitoring stations of Trung Yen in Cau Giay district, Kim Lien in Dong Da district, My Dinh in Nam Tu Liem district and Tan Mai in Hoang Mai district showed increases in good air quality days, accounting for 100%, 71.4%, 71.4%, 57.1%, and 42.9% respectively. No monitoring indicator exceeds the Vietnamese standard.
At urban traffic site air monitoring stations on Hang Dau street, Hoan Kiem and Thanh Cong areas, the AQI remained at the average level. Hoan Kiem air monitoring station, however, acknowledged one day with AQI at a good level on July 5.
Meanwhile, the records by two air monitoring stations in Minh Khai ward, Hai Ba Trung district and on Pham Van Dong street in Bac Tu Liem district showed that during last week, air quality stayed at the average level under the pressure of high traffic.
The highest AQI tracked in these areas were 94 and 78 respectively, with the highest daily concentrations of fine particulate matter (PM2.5) of 44.7µg/m3 and 40.29µg/m3 respectively, below the Vietnamese air standard of 50µg/m3.
