ISTANBUL—The Vietnamese capital, Hanoi, topped the list of the world’s most polluted cities on Friday, according to daily weather data.
Data from AirVisual, an independent provider of global air pollution figures, showed the PM2.5 concentration in the air was “currently 13.2 times” the World Health Organization’s annual guideline value.
PM2.5 measures the levels of hazardous small particles in the air.
Daily Vietnam News reported that the air quality was “unhealthy,” and the air quality index (AQI) turned brown to 309 in some places.
The AQI ranges between zero and 500—the higher the number, the greater the pollution and health impacts.
AirVisual has advised people in Hanoi to avoid outdoor exercise, close their windows to avoid dirty outdoor air and wear masks outdoors. (Anadolu)