Question to the Department for Transport:

To ask the Secretary of State for Transport, what steps his Department is taking to ensure that toxic emissions are monitored effectively during MOT testing.

The current test has been amended over recent years to introduce lower emission limits. The removal of after treatment devices, such as diesel particulate filters and selective catalytic reduction devices, have been added to the list of reasons why a vehicle would fail its MOT.

In May 2018, the opacity limits for diesel vehicles will be tightened for newer diesel vehicles.