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Sky turns dark as polluted air blankets Hanoi

Thursday, March 28, 2019, 14:13 GMT+7
Sky turns dark as polluted air blankets Hanoi
Polluted air blankets Hanoi on March 27, 2019. Photo: Nam Tran / Tuoi Tre

As clouds of polluted air enveloped Hanoi on Wednesday, a hazy atmosphere descended onto the capital.

Air quality in Vietnam’s capital city has been extremely poor over the past few days, with the situation exacerbated on Wednesday by a phenomenon called temperature inversion.

In such districts as Ha Dong, Trung Yen, My Dinh, and Cau Giay, where roads are often congested and many construction projects dot the landscape, the air quality index (AQI) ranged from 150 to 200 yesterday. Any index above 150 is considered unhealthy for local residents.

According to Hoang Duong Tung, president of the Vietnam Clean Air Partnership (VACP), air quality typically worsens when temperature inversion occurs.

Temperatures are normally lower at higher altitudes, Tung elaborated, adding that temperature inversion happens when mecury at those altitudes heats up.

Thanh Xuan District, one of the most populated neighborhoods in Hanoi. Photo: Nam Tran / Tuoi Tre

Thanh Xuan District, one of the most populated neighborhoods in Hanoi. Photo: Nam Tran / Tuoi Tre

Polluted air is, as the result, prevented from spreading to high altitudes and thus gets trapped in the lower layers, hence the dark shadow is cast over the city.

The cloud of dust is expected to linger over the city for the next two to three days before a cold spell brings rains on March 31, said Tran Qang Nang, an official from the National Center for Hydro-meteorological Forecasting.

The intersection of Nguyen Trai and Khuat Duy Tien in Ha Dong District. Photo: Nam Tran / Tuoi Tre

The intersection of Nguyen Trai with Khuat Duy Tien in Ha Dong District. Photo: Nam Tran / Tuoi Tre

It is highly recommended that citizens monitor the city’s air quality at hanoi.gov.vn and properly prepare themselves before heading outside.

Reports from local authorities show that there are currently 5.8 million motorbikes and 700,000 automobiles registered in the capital and an additional 1.2 million vehicles currently in the city but registered to other provinces.

Air quality is poorest during the morning and evening rush hours.

The neighborhoods along Pham Van Dong Street in Cau Giay District. Photo: Nam Tran / Tuoi Tre

The neighborhoods along Pham Van Dong Street in Cau Giay District. Photo: Nam Tran / Tuoi Tre

An area along Thang Avenue. Photo: Nam Tran / Tuoi Tre

An area along Thang Long Avenue. Photo: Nam Tran / Tuoi Tre

Ho Tay (West Lake) in Hanoi on on March 27, 2019. Photo: Nam Tran / Tuoi Tre

Ho Tay (West Lake) in Hanoi on on March 27, 2019. Photo: Nam Tran / Tuoi Tre

Lang Street in Dong Da District. Photo: Nam Tran / Tuoi Tre

Lang Street in Dong Da District. Photo: Nam Tran / Tuoi Tre

Bac Tu Liem and Nam Tu Liem Districts. Photo: Nam Tran / Tuoi Tre

Bac Tu Liem and Nam Tu Liem Districts. Photo: Nam Tran / Tuoi Tre

Skyscrapers in Hanoi. Photo: Nam Tran / Tuoi Tre

Skyscrapers in Hanoi. Photo: Nam Tran / Tuoi Tre

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