Great Smog 60 years on: 'New laws needed to clean London's air'

Sixty years ago thick smog descended on London, contributing to the deaths of an estimated 4,000 people. The four-day "pea-souper", while worse than usual, was a familiar experience for Londoners. Visibility was so poor buses and taxis ground to a halt, forcing commuters to hurry underground to use the Tube.

Centre Deputy Director Frank Kelly talks to the BBC about this, and how new laws are needed to tackle today's air pollution problems.