Hanoi's temperatures were at 21 degrees Celsius at noon on Thursday, with an air moisture level at over 90%. There were drizzles, and streets in the capital were shrouded in mist.
The Turtle Tower at the Hoan Kiem Lake seems opaque behind a layer of mist.
Cloudy weather conditions made it difficult for particulate matter to dissipate. The Air Quality Index (AQI) at Hoan Kiem District reached 245, deemed to be able to adversely impact people's health.
Fog layers at the Ly Thai To monument area could be so thick that it was hard to make out people on the streets.
Tourists take photos on the The Huc Bridge across the Hoan Kiem Lake.
Drizzles, fog and high moisture levels in Hanoi and other northern Vietnam localities began from Feb. 16 due to impacts of cold air that brought in moisture from the sea.
During moments when the rain subsided, the air remained misty.
Hanoi will continue to see cloudy and rainy days until Wednesday next week, according to the National Center for Hydro-Meteorological Forecasting.
