'Impossible-to-cheat' emissions tests show almost all new diesels still dirty

Other new research shows diesel vehicles cause 88% of the 6bn annual damage to people's health from car and van exhaust in the UK

Emissions tests that are impossible for carmakers to cheat show that almost all diesel car models launched in Europe since the "dieselgate" scandal remain highly polluting.

The test uses a beam of light to analyse the exhaust plume of a car as it passes and automatic number plate recognition to link the measurement to a specific model. More than 370,000 such measurements taken in the UK, France and other countries have been compiled into new rating system called The Real Urban Emissions Initiative (True) and made available to the public on Wednesday.