Hanoi declared world's most polluted city

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.

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Levels of hazardous small particles, known as PM2.5, were measured at 266 micrograms per cubic metre in Hanoi early on Jan 3, the highest reading among a list of most-polluted cities, according to AirVisual, which provides independent global air pollution information via a phone app.

The South-east Asian country, a regional manufacturing hub with one of the fastest-growing economies in Asia, has reported severe air pollution in its major cities for years, particularly in Hanoi.