BBC: The air quality in some of the UK's biggest cities is unlikely to meet EU standards before 2030, according to the government.
Member states were supposed to meet targets on pollutants from diesel cars and trucks by 2010.
The nitrogen dioxide (NO2) they produce is linked to a range of respiratory ailments.
But the European Court of Justice heard that London, Leeds and Birmingham could still be above these goals in 2030.
The court has been hearing evidence in a civil case brought by air...