World Car Free Day is back again, falling on 22 September every year. It is a day when the whole world campaigns to reduce the use of personal cars and turn to using mass transit or bicycles instead in order to reduce the problem of air pollution and traffic congestion. This year, Bangkok is holding a big event at Banthat Thong in the heart of Bangkok, clearing the roads where cars run to make way for people to walk. What kind of event is being held and what's interesting to follow? Follow the report . Source: Thai News Agency