Highway emission study with a DOAS in the Inn Valley near Innsbruck

A DOAS with emitter/receiver unit and three retroreflectors was used to study the development of high air pollution episodes in a valley with transit traffic, urban areas and industry a highway emission study was performed in the Inn valley near Innsbruck, Austria. One retroreflector was installed at a telephone emitter mast on the other side of the highway (120 m path length) so that the path was about 10 m above highway level. Another retroreflector was set up for a path parallel to the highway and the third retroreflector was used to operate a path perpendicular and away from the highway. The path across the highway was directly above the air quality station Vomp, which is situated only three metres away from the motorway. The first measurement campaign was carried out between October 2005 and February 2006. The concentrations of NO and NO2 above the highway are clearly dominated by the traffic volume. Higher concentration values were found during weekdays than during the weekend and in the morning and evening peak hours respectively. The concentrations above the highway are compared to those measured at the other DOAS paths and at two other locations, i.e. near the highway as well as at a distance of about 1 km. These data are investigated regarding the temporal variations of highway emissions (10-fold higher during peak hours in the morning and afternoon compared with the night) and dispersion conditions. During synoptically undisturbed winter periods the persistent inversion conditions led to relatively high air pollutant concentrations from late afternoon until mid-morning. In the afternoon the stable layer is potentially broken up. In this context the influences of the quasi-regular mountain wind system (valley and slope winds) are studied. For the covering abstract see ITRD E141518.

• Corporate Authors:

  Technical University Graz

  Institute for Internal Combustion Engines and Thermodynamics, Inffeldgrasse 25
  A-8010 Graz,   Austria 
• Authors:
  • SCHAEFER, K
  • OBLEITNER, F
  • VERGEINER, J
  • HOFFMAN, M
  • WITTIG, J
  • EMEIS, S
  • SUPPAN, P
• Conference:
  • 16th International Transport and Air Pollution Congress
  • Location: Graz , Austria
  • Date: 2008-6-0
• Publication Date: 2008

Language

• English

Subject/Index Terms

• TRT Terms: Air pollution; Conferences; Freeways; Highways; Nitrogen oxides; Off peak periods; Passes (Mountains); Peak periods; Pollutants; Slopes; Wind
• ITRD Terms: 2452: Air pollution; 8525: Conference; 2442: Emission; 2755: Highway; 2752: Motorway; 2717: Mountain pass; 7380: Nitrogen oxide; 611: Off peak hour; 612: Peak hour; 2831: Slope (terrain); 2554: Wind
• Subject Areas: Data and Information Technology; Environment; Highways; I15: Environment;

Filing Info

• Accession Number: 01323213
• Record Type: Publication
• Source Agency: TRL
• Files: ITRD
• Created Date: Dec 22 2010 8:42AM