A Department of Transport ( DfT ) investigation has revealed that some commercial vehicles are still emitting up to 12 times the EU maximum limit for vehicle - tested emissions , with the average emission being five times higher . During the six month investigation , using ' real - world ' conditions rather than approved emission measurements , all cars , consisting of 37 different emission models , failed to meet the EU standards . There was no evidence of " test - cycle manipulation strategies " that mired Volkswagen in controversy last year .
A Department of Transport (DfT) investigation has revealed that some diesel vehicles are still emitting up to 12 times the EU maximum limit for road-tested emissions, with the average emission being five times higher. During the six month investigation, using 'real-world' conditions rather than approved laboratory measurements, all cars, consisting of 37 different vehicle models, failed to meet the EU limit. There was no evidence of "test-cycle manipulation strategies" that mired Volkswagen in controversy last year.