Luftfremdstoffe / Umwelttechnik  
Immissionen / NABEL
Quellenzuordnung von Luftfremdstoffen
Atmosphärische Modellierung / Fernerkundung
Emissionen und Isotope
Laser Spektroskopie
Global Atmosphere Watch (GAW)
Klimagase

PM10 emission factors of abrasion particles from road traffic (APART)
Traffic @ Weststrasse

Recent studies have shown clear contributions of non-exhaust emissions to the traffic related PM10 load of the ambient air. These emissions consist of particles produced by abrasion from brakes, road wear, tire wear, as well as vehicle induced resuspension of deposited road dust. The main scope of the presented work was to identify and quantify the non-exhaust fraction of traffic related PM10 for two road-side locations in Switzerland with different traffic regimes. The two investigated locations, an urban street canyon with heavily congested traffic and an interurban freeway, were considered as being typical for Central Europe. Mass-relevant contributions from abrasion particles and resuspended road dust mainly originated from particles in the size range 1-10 ìm. The results showed a major influence of vehicle induced resuspension of road dust. In the street canyon, the traffic related PM10 emissions (Light Duty Vehicles: 24 ± 8 mg/km/vehicle, Heavy Duty Vehicles: 498 ± 86 mg/km/vehicle) were assigned to 21% brake wear, 38% resuspended road dust and 41% exhaust emissions. Along the freeway (Light Duty Vehicles: 50 ± 13 mg/km/vehicle, Heavy Duty Vehicles: 288 ± 72 mg/km/vehicle), respective contributions were 3% brake wear, 56% resuspended road dust and 41% exhaust emissions.

Mobile Load Simulator

From experiments with Mobile Load Simulators it was derived that direct particle emissions due to abrasion from pavements in good condition are quite low in the range of only a few mg/km per vehicle if quantifiable at all. Considerable abrasion emissions, however, can occur from damaged pavements. Resuspension of deposited dust can cause high and extremely variable particle emissions depending strongly on the dirt load of the road surface. Porous pavements seem to retain deposited dust better than dense pavements, thus leading to lower emissions due to resuspension compared to pavements with a dense structure (e.g. asphalt concrete). Tyre wear seemed not to be a quantitatively significant source of PM10 emissions from road traffic.

Acknowledgment
We gratefully acknowledge the financial support of the Swiss Federal Roads Authority (ASTRA) and the Federal Office for the Environment (FOEN).

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