Tolworth Roundabout

MQT on 2007-01-30
Session date: 
January 30, 2007
Question By: 
Mike Tuffrey
Liberal Democrats
Asked Of: 
The Mayor


What is the current level of air quality at the Tolworth A3 roundabout, how does this compare to targets in your Air Quality Strategy, and what impact do you expect the proposed Tescos development to have on air quality in the area?


Answer for Tolworth Roundabout

Answer for Tolworth Roundabout

Answered By: 
The Mayor

The Environmental Assessment (EA) for the development at The Bridge, Tolworth, states that 'The adverse impact of the development associated traffic on NO2 and PM10 concentrations will be greatest at the junction of the A3 Kingston Bypass and Kingston Road.' The modelling shows, though, minor increases in PM10, but significant increases in NO2. Modelling predicts an increase in NO2 of 2.7ug.m-3 (microgrammes per cubic metre of air) at one receptor (7 Bell Court), as a worst case. This is made up of: 2.2ug.m-3 from traffic and 0.5ug.m-3 from the planned combined heat and power plant. Other receptors show smaller increases. The EA states that the development will introduce new receptors (ie people) into an area of existing poor air quality.The EA suggests a number of mitigation proposals to reduce the increase in emissions. These include:· Adopting the London Best Practice Guidance to Control Dust and Emissions from Construction and Demolition Sites (launched by the GLA and London Councils on 21/11/06· Encouraging sustainable transport (foot, bicycle, bus and train) and reducing dependence on private cars· The design should include the provision of mechanical ventilation, rather than openable windows, to serve rooms with facades adjacent to the A3., in line with NSCA guidance. Ideally these rooms would be non-habitable - bathrooms and kitchens for example.· Barriers (dense vegetation or screening) could be used between the development and the A3.The Environmental Assessment (EA) indicates that the development will worsen air quality at some locations due to increased traffic and from the proposed combined heat and power (CHP) plant. The EA suggests that mitigation is put in place to reduce vehicle exhaust emissions during the construction phase and when the development is occupied, reduce the dependence on private cars, encourage the use of more sustainable forms of transport and reduce the exposure of residents through building design