Ultrafine dust levels were in the red (hazardous-to-health) in 46 out of the 77 provinces and in Greater Bangkok on Wednesday morning, with only 10 provinces reporting moderate to good air quality.
The Geo-Informatics and Space Technology Development Agency (Gistda) reported at 8am that PM2.5 was at red levels in 46 provinces and at orange (starting to affect health) levels in 21 provinces. Most were in the Central Plain, the Northeast and the East.
