Thang Long Highway at 7 am.

Nguyen Chi Thanh Street overpass, Hanoi at 6:15 am.

At 6:45 am, the sun could not break the mist.

Long Bien Bridge at 7:30 am.

Nhat Tan Bridge in haze.

Chuong Duong Bridge at 7:45 am.

Through the haze the fishing village on the Red River looks like a picture.

The Huc Bridge at 8am.

Ba Dinh Square at 9am.

The West Lake at 10 am.

A man takes his baby to the West Lake in the morning.

At nearly 11am, when the sun was high, people could still see mist at Ly Tu Trong flower garden.

In HCM City, many areas were covered by fog on Oct. 21, which lasted until midday.

Kinh Bac Bridge to Thanh Da peninsula.

The Saigon River, the section in Binh Thanh and Thu Duc district.

Highway 1A in District 12.

The Hanoi Highway was covered by fog every morning for almost a week.

Cong Hoa Street, Tan Binh District at 8am on October 19.

High-rise buildings are hidden in the morning dew.

Ms. Le Thi Xuan Lan, from the Southern Region Hydrometeorology Station, said this

phenomenon not only appeared in HCM City but also in other provinces.

The cause is the spread of cold air plus haze pollution.

She said this weather may continue for several more days and it can affect people's health.

She advised people to not use rainwater during this period because of the pollution.