Why does air pollution comes with cold weather in tropical areas? I reside in Bangkok where the local press have reported several times these two last months November-December about high levels of smog. A similar phenomenon occurred last year in this period (end of the tropical cold season); both this year and last year, when this smog was very evident I felt colder than in other days of the year.
Why does air pollution comes with cold weather in tropical areas?
Crop burning is a major cause.  Crops are burnt Lal across Thailand between December and march and air movements bring large concentrations south to Bangkok.  Even today islands as remote as Koh Phangan are 135 on AQI.  Can't imagine tourism can work with crop burning.