dirty diesel cabs to disappear from the sea. street sooner rather than later. she s concerned about the health of london s children which is why she founded the mums for lungs initiative. insists on like that it s a template traditional black caps are amongst the biggest contributors to nitrogen oxides in fine particle emissions in central london there are all these will power it so it s great that gradually disappeared from wall street side to every one of those i sees as a fifteen year operating license so it will be twenty thirty three before that whole workplace quite eternities. but steve kansan thinks the change is happening too fast he feels overwhelmed and he s not alone one colleague owns eighty diesel powered cabs on the governor to service them. and he s worried he would have to start from scratch when that down from london