Forty-one of the 77 provinces were shrouded with unsafe levels of ultra-fine dust, the greatest number in the Central Plain, on Monday morning.
The Geo-Informatics and Space Technology Development Agency (Gistda) reported the accumulation of particulate matter 2.5 micrometres and less in diameter (PM2.5) at 8am.
Unsafe PM2.5 levels ranged from 38.1 to 112.3 microgrammes per cubic metre of air over the past 24 hours. The government’s set safe threshold is 37.5µg/m³.
Three provinces were blanketed by red-code levels of…
