Clean Air Fund - Green Infrastructure

MQT on 2012-01-25
Session date: 
January 25, 2012
Question By: 
Mike Tuffrey
Liberal Democrats
Asked Of: 
The Mayor


Further to MQ 3132/2011 and 3329/2011, when will you evaluate the cost and effectiveness of using green infrastructure (e.g. street trees, green walls and low-level hedges) to remove dangerous airborne particles from London's air?


Answer for Clean Air Fund - Green Infrastructure

Answer for Clean Air Fund - Green Infrastructure

Answered By: 
The Mayor

The evaluation of the effectiveness of green infrastructure in trapping particulate matter (PM10) is under way. TfL has commissioned Imperial College (part of the Air Pollution Research in London group) to undertake research. They are collecting leaf samples from the planted towers on Lower Thames Street, the green wall at Edgware Road Tube station and selected sites where trees and shrubs are being planted.

This research will continue until April when TfL hopes that a new MSc thesis will continue the work. TfL does not envisage that any meaningful results will be available until the summer, when it expects to receive some comparative data to enable it to determine which species are better at trapping PM10. Leaf samples from deciduous species obviously cannot be taken until the spring.

TfL hopes that it will be able to work with the Air Pollution Research in London group beyond the Clean Air Fund programme to continue the research on air quality and wider benefits of green infrastructure.