Impact of London Congestion Charge Scheme on Air Pollution


The impact of the congestion charging scheme on ambient air pollution concentrations in London (21 page pdf, R.W. Atkinson, B. Barratt, B. Armstrong, H.R. Anderson, S.D. Beevers, I.S. Mudway, D. Green, R.G. Derwent, P. Wilkinson, C. Tonne, F.J. Kelly, Atmospheric Environment, Volume 43, Issue 34, Pages 5493-5500, Nov, 2009)
Today’s reviewed report is a land mark report on London’s congestion charging system, introduced in 2003. The authors found significant reductions in pollutants in the charging and boundary zone as a function of distance from the centre, using both roadside and ambient monitors, reflecting the 18% reduction in traffic. Finding the precise impact of the charging system was made more difficult because of changes in the ambient air quality across the entire city and other measures that extended beyond the relatively small (22 km2) charging zone, factors that future congestion charging schemes would need to take into account.

Percentage change in geometric mean pollutant concentrations at background monitoring stations stratified by station location (within zone, boundary and control zones) and distance from CCZ centre

0 indicate stations within CCZ,

1 with cross indicate stations surrounding the zone boundary( indicate stations in control zone (8 km+ from zone centre).

The Y axis shows percent change pre-post CCS implementation and the X-axis shows the distance in km from the centre of the charging zone

To see Key Quotes and Links about this post, go to the new internet platform for Pollution Free Cities by clicking HERE

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