Written Question·Department for Transport·UIN 95690
Diesel Vehicles: Exhaust Emissions
Tabled: 1 December 2025
Answered: 9 December 2025
Question
Helen Hayes
Labour — Dulwich and West Norwood
To ask the Secretary of State for Transport, what estimate her Department has made of the potential impact of non-compliant diesel vehicles on the UK’s ability to meet its legally binding carbon budgets and net-zero targets.
Answer
Simon LightwoodEmissions projections for diesel vehicles used in carbon budgets modelling account for the difference between reported vehicle CO2 emissions, tested currently using the World Light Duty Test Procedure, and emissions from vehicles operating in ‘real-world’...
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