Chiang Mai spent several days this month as the most polluted city on the planet, with PM2.5 levels reaching 226 microgrammes per cubic meter (μg/m³) there. The predictability of the annual surge in pollution and the lack of effective preventative action have angered city residents and concerned civil society groups.
heating up: A satellite imagery shows hotspots in and around northern Thailand on March 19.
Pollution levels peak in northern Thailand during the burning season — normally in March and April — when crop waste burning and forest fires fill the air with particles, creating a haze so dense that Doi Suthep mountain, on the western…
