Vietnamese capital Hanoi tops list of most polluted cities

HANOI - The streets of Vietnam's capital city Hanoi were enveloped in thick smog on Monday (March 4), which dramatically reduced visibility due to air pollution caused by high levels of particulates from vehicle emissions and construction-linked fine dust.

Levels of hazardous small particles known as PM2.5 in the air in Hanoi were at 187 micrograms per cubic metre late on Monday, the highest among a list of most polluted international cities, according to data from AirVisual, which provides independent global air pollution information via a phone app.

"This is damaging for our health," said Duong Kim Oanh, a 58-year-old Hanoi resident. "I think Hanoi's pollution is caused by a large number of personal vehicles and the fine dust from all the construction, plus this cold weather."

According to a 2021 World Bank report, emissions from Hanoi's eight million registered vehicles made up 30 per cent of air particulate pollution, and industry emissions another 30 per cent.

The pollution "will affect people's respiratory system, making people feel sick or even suffocated," said another resident Pham Thi Phuong.

Nearly 100 flights to and from the international airport in Hanoi were delayed or diverted to other cities on Feb 2 due to heavy fog and worsening air pollution.

Hanoi flights halted as city faces worsening air pollution