As parents walk with their children next to four lanes of fume-belching traffic in Kingston, Oliver Lord sighs. “We shouldn’t be setting a carer with a car against a mum looking after her son with asthma in hospital,” says Lord, who is head of strategy for the Clean Cities campaign.
He and other campaigners are dismayed at how clean air has become a political battleground, with tensions rising over plans to extend an ultra-low emission zone (Ulez) to cover the whole of Greater London.
