
PM2.5 reached dangerous levels in parts of the North and West on Thursday morning, while Samut Songkhram was the only province in the red zone, with unhealthy levels of smog.
The Geo-Informatics and Space Technology Development Agency (Gistda) reported at 9am on Thursday that the central province of Samut Songkhram, located west of Bangkok, recorded 77.1 microgrammes of PM2.5 per cubic metre of air over the past 24 hours.