Congested Bangkok opens subway

A new underground railway system has opened in Bangkok, one of the world's most traffic congested cities.

Thailand's capital already has an above ground rail system - the Sky Train.

But the new subway, built at a cost of $7.5 billion, goes further into the city's sprawling suburbs.

For many it is not just a question of convenience.

Government figures suggest that one in six people living in the capital suffer from breathing problems linked to traffic pollution.

--BBC