People in upper northern areas of Thailand were still choking on hazardous levels of smog on Wednesday.
Red-zone levels of ultra fine dust were recorded in 20 areas, where PM2.5 levels were above 90 microgrammes per cubic metre (µg/m³), which was hazardous to health, the Department of Pollution Control reported.
As of 11am, PM2.5 levels nationwide during the previous 24 hours ranged from 10-356 microgrammes per cubic metre (µg/m³). The government-set safe level is 50 µg/m³.
In Bangkok and surrounding provinces, PM2.5 levels were 29-99 µg/m³. Twenty-six areas were over the safe treshold of 50 µg/m³ and one spot on Kanchanapisek road…
