PM2.5 IN BANGKOK
PM 2.5 has been a problem for over a decade and intensifies during the cool season. Currently, high pressure from China covering Bangkok from December to early February prevents PM2.5 from rising up and being dispersed at a higher altitude.
The major source of PM2.5 in Bangkok is from transportation and burning, according to the Pollution Control Department.
Dust particles from construction sites are bigger than PM2.5 but still cause pollution. Major infrastructure projects including the Skytrain and subway systems are paralysing traffic across the city, which does worsen PM2.5 levels.