From BBC News today….
“Thailand's capital city is experiencing some of its worst-ever air pollution levels, caused by ultra-fine dust particles known as PM2.5. Traffic exhaust, construction works, burning crops and pollution from factories are blamed for the haze. Specialist respirator masks to filter the particles have quickly sold out. The government has tried seeding rain clouds, reducing traffic, and hosing down streets, with little impact. Those celebrating the Lunar New Year holidays next week have been asked not to burn incense or light fireworks.”