Question to the Department for Transport:

To ask the Secretary of State for Transport, what recent assessment his Department has made of the difference in emissions from Euro 6 diesel engines and petrol engines.

The Department for Transport published the outputs of the Transport Energy Model in July 2018 alongside the Road to Zero strategy.

The model estimates the average tailpipe emissions of air pollutants, the greenhouse gas emissions and the energy consumption of a range of fuel, powertrain and Euro class options, which includes Euro 6 diesel and petrol engines for cars, vans, buses and heavy goods vehicles (HGVs).

More information on the development and outputs of the model is available here: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/739462/transport-energy-model.pdf.