Particle concentration and characteristics near a major freeway with heavy-duty diesel traffic

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Leonidas Ntziachristos
  • Zhi Ning
  • Michael D. Geller
  • Constantinos Sioutas

Detail(s)

Original languageEnglish
Pages (from-to)2223-2230
Journal / PublicationEnvironmental Science and Technology
Volume41
Issue number7
Publication statusPublished - 1 Apr 2007
Externally publishedYes

Abstract

This study presents the number, surface and volume concentrations, and size distribution of particles next to the I-710 freeway during February through April 2006. I-710 has the highest ratio (up to 25%) of heavy-duty diesel vehicles in the Los Angeles highway network. Particle concentration measurements were accompanied by measurements of black carbon, elemental and organic carbon, and gaseous species (CO, CO2). Using the incremental increase of CO2 over the background to calculate the dilution ratio, this study makes it possible to compare particle concentrations measured next to the freeway to concentrations measured in roadway tunnels and in vehicle exhaust. In addition to the effect of the dilution ratio on the measured particle concentrations, multivariate linear regressions showed that light and heavy organic carbon concentrations are positively correlated with the particle volume in the nucleation and accumulation modes, respectively. Solar radiation was also positively correlated with the particle surface concentration and the particle volume in the accumulation (40-638 nm) mode, presumably as a result of secondary particle formation. The methods developed in this study may be used to decouple the effect of sampling position, meteorology, and fleet operation on particle concentrations in the proximity of freeways, roadway tunnels, and in street canyons. © 2007 American Chemical Society.

Citation Format(s)

Particle concentration and characteristics near a major freeway with heavy-duty diesel traffic. / Ntziachristos, Leonidas; Ning, Zhi; Geller, Michael D.; Sioutas, Constantinos.

In: Environmental Science and Technology, Vol. 41, No. 7, 01.04.2007, p. 2223-2230.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review