PM2.5 — The Mae Hong Son Loop Particles under 2.5 micrometres across — small enough to go past the nose and into the lungs. nanobotco.github.io/mae-hong-son-loop/term/pm25/ · 18-Sep-2026 · 47K
Riding in the smoke — The Mae Hong Son Loop In March and April the measured PM2.5 on this circuit sits above the US 24-hour standard on most days. On a bike you are breathing hard, at volume, for six hours. nanobotco.github.io/mae-hong-son-loop/hazard/smoke-riding/ · 18-Sep-2026 · 48K
Burning season — The Mae Hong Son Loop Roughly late February to late April, agricultural and forest burning fills the valleys of upper northern Thailand and adjacent Myanmar with smoke. It ends with the first rains. nanobotco.github.io/mae-hong-son-loop/event/burning-season/ · 18-Sep-2026 · 49K