ASA bans ad to remove pollution filters from diesel cars

Diesel filters cost 1,000 to replace so many garages exploit legal loophole by removing filter letting cars pump out toxic particles

The rogue practice of removing vital pollution filters from the exhausts of diesel vehicles has suffered a blow with the Advertising Standards Authority (ASA) for the first time banning an advert for the service.

However the number of filterless cars on UK roads, pumping out high levels of toxic particles, remains unknown and air pollution campaigners say the government must investigate and then crack down on the shady practice.