Vietnam’s capital has been blanketed in toxic air for weeks with one index briefly making Hanoi the world’s most-polluted city on Friday, putting pressure on authorities to take tougher action to tackle the smog.

The Vietnamese capital Hanoi topped the list of the world’s most polluted city on Friday, according to daily weather data. Data from AirVisual, an independent provider of global air pollution figures,

Vietnam's capital Hanoi has been covered in thick smog over recent weeks, putting it at the top of a list of the world's most polluted cities, as the government said it would push for more electric vehicles (EVs) to alleviate the problem.

According to data from AirVisual, Hanoi, the capital of Vietnam, has the most polluted air in the world. On Friday, January 3, at 10:00 AM Eastern Time, the concentration of harmful PM2.5 particles was 266 micrograms per cubic metre.