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  • 1. Ahlvik, P
    et al.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Westerholm, Roger
    Stockholm University, Faculty of Science, Department of Analytical Chemistry.
    Åsman, P
    Exhaust emissions from flexi-fuel light-duty passenger cars fuelled by petrol (E5) and bioethanol (E70, E85) tested at ambient temperatures of +22°C and -7°C: Part 1:Regulated and particulate emissions.2008In: Proceedings of the17:th International Symposium on Alcohol Fuels, 2008Conference paper (Other academic)
  • 2. Hussein, T.
    et al.
    Johansson, C
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Karlsson, H
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Hansson, H
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Factors affecting non-tailpipe aerosol particle emissions from paved roads: on road measurements in Stockholm, Sweden.2008In: Atmos. Environ., Vol. 42, p. 688-702Article in journal (Refereed)
  • 3. Hussein, T.
    et al.
    Johansson, Christer
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Hansson, Hans-Christen
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Factors affecting non-tailpipe aerosol particle emissions from paved roads: on road measurements in Stockholm, Sweden.2007In: Atmos. Environ.Article in journal (Refereed)
  • 4.
    Johansson, Christer
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Hussein, T.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Betydelsen av bullerreducerande beläggning för partikelemissionerna.2007Report (Other (popular science, discussion, etc.))
  • 5.
    Johansson, Christer
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Sjövall, B.
    Ferm, M.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Vecely, V.
    Krecl, P.
    Ström, Johan
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Relationerna mellan halterna av PM10, PM1 och sot i Sverige.2007Report (Other (popular science, discussion, etc.))
  • 6.
    Karlsson, H
    et al.
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Elihn, K
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Copper oxide nanoparticles are highly toxic in vitro - a comparison between different nanoparticles2008In: Nanotoxicology - 2nd International Conference: 7-10 September, Zürich, Switzerland, 2008Conference paper (Refereed)
  • 7. Mueller, T.
    et al.
    Henzing, J. S.
    de Leeuw, G.
    Wiedensohler, A.
    Alastuey, A.
    Angelov, H.
    Bizjak, M.
    Coen, M. Collaud
    Engström, J. E.
    Stockholm University, Faculty of Science, Department of Meteorology .
    Gruening, C.
    Hillamo, R.
    Hoffer, A.
    Imre, K.
    Ivanow, P.
    Jennings, G.
    Sun, J. Y.
    Kalivitis, N.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Komppula, M.
    Laj, P.
    Li, S-M
    Lunder, C.
    Marinoni, A.
    dos Santos, S. Martins
    Moerman, M.
    Nowak, A.
    Ogren, J. A.
    Petzold, A.
    Pichon, J. M.
    Rodriquez, S.
    Sharma, S.
    Sheridan, P. J.
    Teinila, K.
    Tuch, T.
    Viana, M.
    Virkkula, A.
    Weingartner, E.
    Wilhelm, R.
    Wang, Y. Q.
    Characterization and intercomparison of aerosol absorption photometers: result of two intercomparison workshops2011In: Atmospheric Measurement Techniques, ISSN 1867-1381, Vol. 4, no 2, p. 245-268Article in journal (Refereed)
    Abstract [en]

    Absorption photometers for real time application have been available since the 1980s, but the use of filter-based instruments to derive information on aerosol properties (absorption coefficient and black carbon, BC) is still a matter of debate. Several workshops have been conducted to investigate the performance of individual instruments over the intervening years. Two workshops with large sets of aerosol absorption photometers were conducted in 2005 and 2007. The data from these instruments were corrected using existing methods before further analysis. The inter-comparison shows a large variation between the responses to absorbing aerosol particles for different types of instruments. The unit to unit variability between instruments can be up to 30% for Particle Soot Absorption Photometers (PSAPs) and Aethalometers. Multi Angle Absorption Photometers (MAAPs) showed a variability of less than 5%. Reasons for the high variability were identified to be variations in sample flow and spot size. It was observed that different flow rates influence system performance with respect to response to absorption and instrumental noise. Measurements with non absorbing particles showed that the current corrections of a cross sensitivity to particle scattering are not sufficient. Remaining cross sensitivities were found to be a function of the total particle load on the filter. The large variation between the response to absorbing aerosol particles for different types of instruments indicates that current correction functions for absorption photometers are not adequate.

  • 8. Pirjola, Liisa
    et al.
    Johansson, Christer
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Kupiainen, Kaarle
    Stojiljkovic, Ana
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Hussein, Tareq
    Road Dust Emissions from Paved Roads Measured Using Different Mobile Systems2010In: Journal of the Air & Waste Management Association, ISSN 1047-3289, Vol. 60, no 12, p. 1422-1433Article in journal (Refereed)
    Abstract [en]

    Very few real-world measurements of road dust suspension have been performed to date. This study compares two different techniques (referred to as Sniffer and Emma) to measure road dust emissions. The main differences between the systems are the construction of the inlet, different instruments for recording particulate matter (PM) levels, and different loads on the wheel axes (the weight of Sniffer was much higher than that of Emma). Both systems showed substantial small-scale variations of emission levels along the road, likely depending on-road surface conditions. The variations observed correlated quite well, and the discrepancies are likely a result of variations in dust load on the road surface perpendicular to the driving direction that cause variations in the measurements depending on slightly different paths driven by the two vehicles. Both systems showed a substantial influence on the emission levels depending on the type of tire used. The summer tire showed much lower suspension than the winter tires (one nonstudded and one studded). However, the relative importance of the nonstudded versus studded tire was rather different. For the ratio of studded/nonstudded, Emma shows higher values on all road sections compared with Sniffer. Both techniques showed increased emission levels with increasing vehicle speed. When the speed increased from 50 to 80 km hrthe relative concentrations increased by 30-170% depending on the tire type and dust load. However, for road sections that were very dirty, Sniffer showed a much higher relative increase in the emission level with the nonstudded tire. Sniffer's absolute concentrations were mostly higher than Emma's. Possible reasons for the differences are discussed in the paper. Both systems can be used for studying relative road dust emissions and for designing air quality management strategies.

  • 9.
    Tunved, Peter
    et al.
    Stockholm University, Faculty of Science, Department of Meteorology .
    Hansson, Hans-Christen
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Kulmala, Markku
    Department of Physics, University of Helsinki,.
    Aalto, Pasi
    Department of Physics, University of Helsinki.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Kristensson, Adam
    Division of Nuclear Physics, Lund University.
    Viisanen, Yrjö
    Finnish Meteorological Institute, Helsinki.
    Swietlicki, Erik
    Division of Nuclear Physics, Lund University.
    Dal Maso, Mika
    Department of Physics, University of Helsinki.
    Ström, Johan
    One year boundary layer aerosol size distribution data from five Nordic background stations2003In: Atmospheric Chemistry and Physics, ISSN 1680-7316, Vol. 3, p. 2183-2205Article in journal (Refereed)
  • 10.
    Westerholm, Roger
    et al.
    Stockholm University, Faculty of Science, Department of Analytical Chemistry.
    Karlsson, Hans
    Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
    Ahlvik, P
    Åsman, P
    Exhaust emissions from flexi-fuel light-duty passenger cars fuelled by petrol (E5) and bioethanol (E70, E85) tested at ambient temperatures of +22°C and -7°C: Part 2:Unregulated emissions and cancer potency.2008In: Proceedings of the 17:th International Symposium on Alcohol Fuels, 2008Conference paper (Other academic)
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