Identification and quantification of particulate tracers of exhaust and non-exhaust vehicle emissions
Open Access
- 17 April 2019
- journal article
- research article
- Published by Copernicus GmbH in Atmospheric Chemistry and Physics
- Vol. 19 (7), 5187-5207
- https://doi.org/10.5194/acp-19-5187-2019
Abstract
In order to identify and quantify key species associated with non-exhaust emissions and exhaust vehicular emissions, a large comprehensive dataset of particulate species has been obtained thanks to simultaneous near-road and urban background measurements coupled with detailed traffic counts and chassis dynamometer measurements of exhaust emissions of a few in-use vehicles well-represented in the French fleet. Elemental carbon, brake-wear metals (Cu, Fe, Sb, Sn, Mn), n-alkanes (C19-C26), light-molecular-weight polycyclic aromatic hydrocarbons (PAHs; pyrene, fluoranthene, anthracene) and two hopanes (17α21βnorhopane and 17α21βhopane) are strongly associated with the road traffic. Traffic-fleet emission factors have been determined for all of them and are consistent with most recent published equivalent data. When possible, light-duty- and heavy-duty-traffic emission factors are also determined. In the absence of significant non-combustion emissions, light-duty-traffic emissions are in good agreement with emissions from chassis dynamometer measurements. Since recent measurements in Europe including those from this study are consistent, ratios involving copper (Cu∕Fe and Cu∕Sn) could be used as brake-wear emissions tracers as long as brakes with Cu remain in use. Near the Grenoble ring road, where the traffic was largely dominated by diesel vehicles in 2011 (70 %), the OC∕EC ratio estimated for traffic emissions was around 0.4. Although the use of quantitative data for source apportionment studies is not straightforward for the identified organic molecular markers, their presence seems to well-characterize fresh traffic emissions.Keywords
This publication has 88 references indexed in Scilit:
- Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matterAtmospheric Research, 2016
- Size-segregated particulate matter and gaseous emissions from motor vehicles in a road tunnelAtmospheric Research, 2015
- Urban air quality: The challenge of traffic non-exhaust emissionsJournal of Hazardous Materials, 2014
- Effects of long-term exposure to air pollution on natural-cause mortality: an analysis of 22 European cohorts within the multicentre ESCAPE projectThe Lancet, 2013
- Sources and variability of inhalable road dust particles in three European citiesAtmospheric Environment, 2011
- Distribution of heavy metals in road dust along an urban-rural gradient in MassachusettsAtmospheric Environment, 2011
- Size and time-resolved roadside enrichment of atmospheric particulate pollutantsAtmospheric Chemistry and Physics, 2011
- Seasonal variation of PM10 main constituents in two valleys of the French Alps. I: EC/OC fractionsAtmospheric Chemistry and Physics, 2007
- Characterization of heavy metal particles embedded in tire dustEnvironment International, 2004
- The ARTEMIS European driving cycles for measuring car pollutant emissionsScience of The Total Environment, 2004