On the road conformity testing of SCR buses

MQT on 2013-09-11
Session date: 
September 11, 2013
Question By: 
Jenny Jones
City Hall Greens
Asked Of: 
The Mayor


Since the completion of the retro fitting of Selective Catalytic Reduction units to buses travelling through Putney High Street, emissions of NO2 have exceeded the annual limit values of no more than 18 hourly permitted exceedances per year (hourly mean >200ug/m3). Between the 9th July and 23rd August, the number of hourly exceedances recorded was 150 times. In order to test the 'on road' effectiveness of the £10m SCR roll out will you undertake to commission the use of a Remote Sensing Device (RSD) study in London, as recently used by DEFRA?


Answer for On the road conformity testing of SCR buses

Answer for On the road conformity testing of SCR buses

Answered By: 
The Mayor

Officers are drafting a response which will be sent shortly.


Written response from the Mayor received 28 October 2013

I am working closely with the London Borough of Wandsworth to improve air quality on Putney High Street. Significant improvements to the fleet of buses operating in this area are being delivered, including retrofitting Euro III buses with selective catalytic reduction (SCR). As part of the evaluation of the SCR retrofit programme King's College London's Environmental Research Group will be undertaking an independent assessment of their effectiveness, including using remote sensing.