North still choking on smog Smog continues to cloak the upper northern region with PM2.5 dust at red-coded levels, and the worst pollution in Mae Hong Son province. Bangkok Post · Apr 11, 2023
Thick smog chokes North, upper Northeast Levels of particulate matter 2.5 micrometres or less in diameter (PM2.5) have reached the "unhealthy" red zone throughout the North and the upper Northeast, with the highest level exceeding the safe threshold of 50 microgrammes per cubic metre (µg/m³) by over eight times, as people in Chiang Mai have been… Bangkok Post · Apr 7, 2023