VOV.VN - Hanoi recorded hazardous air pollution levels on the evening of December 7, with fine particulate matter (PM2.5) spiking to 35 times the World Health Organisation’s recommended limit and the city briefly ranking as the world’s most polluted, according to air quality monitor IQAir.
VOV.VN - Vietnam will build 98 more air quality monitoring stations in all 63 cities and provinces across the country till 2030.