Question to the Department for Transport:

To ask Her Majesty's Government, further to the Written Answer by Baroness Sugg on 24 October (HL10536), what proportion of NO2 exceedance in NOX targets is attributed to buses as opposed to other traffic.

On average, local road traffic and road traffic background are respectively responsible for around 60% and 18% of UK roadside NOx concentrations. On average, buses contribute around 16% of the NOx concentrations from local road traffic. We do not have statistics on how much of the NO2 exceedance is attributed to buses.

Since 2010 the Government has provided almost £150 million to help bus operators and local authorities purchase cleaner buses, and £67 million to retrofit existing bus fleets to a minimum Euro VI standard.