A levy on drivers of older cars with dirtier engines has pushed many of them off London’s roads, reducing pollution that’s been blamed for thousands of deaths in the capital each year. Yet some Londoners still resent the £12.50 ($15.80) daily charge for entering the Ultra Low Emission Zone. When city officials expanded it to London’s outskirts last August, resistance coalesced online, and some of the cameras that monitor ULEZ compliance were vandalized. The hostile reaction showed the risk of tr