UK air pollution: Government warned of legal action

An environmental campaign group is threatening to take the Government back to court over air pollution levels in the UK.

In April 2015, a group of environmental lawyers won a case against the government at the Supreme Court, arguing its plans to cut illegal levels of pollutants were inadequate.

Since then, the government has tightened the rules, but Client Earth says the public's health is still at risk. So how bad is it?

The BBC's Richard Daniel reports.