Traffic is one of the most important causes of air pollution in Bangkok. Bangkok traffic was said to create high level of dust particles, and Carbon Monoxide. BMTA buses, trucks and smaller transport vans were frequently stopped for on-the-road checking.
The rapid growth of Bangkok has severely stained its facilities and led to a number of serious problems.
The city now has over a million registered motor vehicles and because of the limited road surface, traffic congestion is heavy in central areas.