Question to the Department for Transport:

To ask Her Majesty's Government, further to the Written Answer by Baroness Sugg on 20 September (HL10301), whether they have considered implementing a target for NOX emissions to be reduced to 4 per cent by 2025; and if so, how much of this improvement is dependent on (1) vehicle design, and (2) policies to reduce traffic congestion.

There is no target to reduce NOX emissions by 4 per cent by 2025. However, all local authorities with levels of NO2 exceedance must achieve legal compliance in the shortest possible time. Measures that could be implemented to achieve this might include reducing NOX emissions from buses by retrofitting them to a minimum Euro VI standard, purchasing low and ultra-low emission buses, implementing bus priority measures and encouraging mode shift to public transport to help reduce traffic congestion.