How lovely and clean London’s air will be once that nice Sadiq Khan’s Ultra Low Emissions Zone (Ulez) has been extended across the entire city and the Government’s ban on petrol and diesel cars has taken effect. Well, not quite. In fact, was there ever such a misnomer as a “zero emission vehicle”? Far from cleaning the air there is evidence that in one respect the adoption of electric vehicles could make pollution worse.Electric vehicles might reduce carbon emissions (though far from eliminating them – indeed their manufacture involves carbon emissions). They might not have exhaust pipes spewing out nitrogen...