Worsening air pollution halts Hanoi flights

All flights to and from the international airport in Vietnam’s capital Hanoi have been delayed or diverted to other cities due to heavy fog and worsening air pollution, said an airport official.

Air Visual, an independent online air quality index monitor, said Hanoi’s levels of hazardous small particles known as PM2.5 in the air were at an extreme high of 257 micrograms per cubic metre early yesterday.