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Pilot Study to Measure Non-Exhaust Particulate Matter Emissions from Road Transport - AQ0735

Within the Ambient Air Quality Directive limit and target values have been set for Particulate Matter (PM10 and PM2.5.). This project focuses on filling important knowledge gaps for the emissions of non-exhaust particle sources in the UK, an emission source that is not regulated but is likely to represent an increasingly important share of transport emissions. A recent report for DEFRA (Jones et al 2013) reviewed current knowledge of non-exhaust PM emissions from road transport.

This review concluded that road traffic is currently a major contributor to primary emissions of both PM2.5 and PM10. As vehicle emissions standard controls lead to progressively lower emissions of particles from vehicle exhaust, non-exhaust emissions arising from the attrition of brakes, tyres and the road surface and from resuspension of road dust are becoming a more prominent contributor to both PM2.5 and PM10 concentrations. Currently, there is no legislation to limit emissions from non-exhaust sources. The review also concluded that improved information about non-exhaust PM emissions from traffic in UK conditions could only be obtained through bespoke measurement campaigns.

This project includes a pilot measurement campaign which will test the methods proposed in Jones et al 2013. The pilot measurement programme would be undertaken alongside the North Circular in Brent. This 40 mph dual carriageway road will provide a contrasting traffic scenario to the previous measurements at Marylebone Road and is in the top quartile of UK roads for non-exhaust emissions. A background site will also be used to enable the quantification of road increments.

A range of routine and research measurement methods will be employed including the use of bespoke equipment loaned from the University of Milan. The project aims to produce emissions factors for different vehicle types for exhaust black carbon and non –exhaust emissions from traffic. These will be compared to factors used in the current National and London inventories and results discussed with the relevant inventory compilers. Also to investigate the feasibility of using measurements of coarse particle size alone to measure non-exhaust traffic emissions and discriminate these by source.

1) Quantify non-exhaust particulate matter emissions for a second UK roadside location, to support measurements already collected at Marylebone Road.
2) Test if measurements of coarse particle size distributions could be used alone to make measurements of non-exhaust particulate matter in the absence of chemical tracers.

Time-Scale and Cost
From: 2014

To: 2014

Cost: £39,070
Contractor / Funded Organisations
Kings College London
Environmental Protection              
Fields of Study
Air Quality