Responding to the Transport Select Committee's recent report on London air pollution, Mr Norris said:
'Lead in urban areas has been cut by over 70% since 1983 significantly reducing the risks to our children. But we can't be complacent. All motorists should continue to use unleaded petrol wherever possible.
'The Transport Select Committee were right to point out the threat which benzene can pose. But the risk posed by lead levels is more immediate.