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  • 1.
    Mattsson, Magnus
    et al.
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Byggvetenskap - installationsteknik.
    Andersson, Lars T
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för bygg- energi- och miljöteknik, Kemi.
    Alm Kübler, Kerstin
    Swedish Museum of Natural History, Laboratory of Palynology.
    Ekebom, Agneta
    Swedish Museum of Natural History, Laboratory of Palynology.
    Jansson, Anders
    Stockholm University, ITM.
    Holmquist, Leif
    Consultant at University of Gävle.
    Vesterberg, Olof
    Consultant at University of Gävle.
    Ventilation filter efficiency for birch pollen allergens: experimental data from one pollen season2011Inngår i: Proceedings from Roomvent 2011 / [ed] Hans Martin Mathisen, Trondheim: Tapir Akademisk Forlag , 2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In an experimental study, ventilation filters of high quality (F7 & F9) were tested regarding their efficiency in collecting birch pollen allergens in outdoor air. The birch pollen grain concentration in outdoor air was measured at the same time as pollen allergen and particle number concentrations were measured before and after the tested ventilation filters, thus enabling collection efficiency calculations. Simultaneously, the size distribution of birch pollen allergens was measured in outdoor air using a cascade impactor. The study confirms previous indications that pollen allergens may occur in outdoor air in particles much smaller than pollen grains, and can penetrate ventilation filters to a larger extent than might be expected. This entails that although the high quality filters collect most of outdoor air pollen allergens, a significant exposure dose to these allergens can occur in the indoor environment, especially when considering the fact most people stay much more indoors than outdoors. The study also confirms previous similar indications attained with grass pollen allergens, in that the allergenic particles tend to penetrate ventilation filters to a greater extent than other airborne particles.

  • 2.
    Mattsson, Magnus
    et al.
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.
    Smedje, Greta
    Holmquist, Leif
    Vesterberg, Olof
    Wålinder, Robert
    Mixing and displacement ventilation compared in classrooms; distribution of particles, cat allergen and CO22003Inngår i: Proceedings from Healthy Buildings 2003: 7th International conference, 2003, s. 458-464Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Mixing ventilation and displacement ventilation were compared in an intervention study in classrooms. Particles, cat allergen and CO2, were measured in classroom air at different levels above the floor, during regular lessons. With mixing ventilation, the particle concentration tended to decrease with height, with a stronger gradient occurring for larger particles. With displacement ventilation, the particle concentration increased with height, except for particles >25 µm. The displacement system thus tended to have a slight upward displacement effect on most of the particles. Significant correlations were found between concentrations of cat allergen and particles in the size fraction 1–10 µm. The particle and cat allergen concentration at breathing height did not, however, differ significantly between the two ventilation systems. CO2 was about 10% lower with displacement ventilation. A fairly high level of physical activity of the pupils is believed to have had significant dispersing effect on the airborne contaminants.

  • 3.
    Mattsson, Magnus
    et al.
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.
    Stojanovic, Bojan
    Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för byggnadskvalitet.
    Elfman, Lena
    Effect of Particulate Air Cleaners on the Content of airborne Dust and Cat Allergen in Classrooms2004Inngår i: Roomvent 2004: 9th international conference on air distribution in rooms, 2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Electrostatic air cleaners (precipitators) were tested in four classrooms during ordinary lessons for four weeks. Airborne dust in the classrooms was collected on filters using two different kinds of samplers: IOM-sampler and a new kind of ionizing sampler. The amount of collected dust was evaluated by visual inspection (“filter blackening”) and the content of cat allergen was measured using an amplified ELISA assay. It was found that the filter blackening was 64% lower when the air cleaners were active than when they where inactive (p<0.001). This suggests that the air cleaners were effective in reducing the content of airborne particulate matter. The reduction in cat allergen appeared however to be less substantial. The variance of the allergen data was unexpectedly large, presumably due to relatively few allergen-carrying particles in the sampled air. It is believed that larger sampling volumes are needed to get more reliable data of airborne cat allergen in spaces where the allergen is emitted indirectly.

  • 4.
    Wang, Xinghui
    et al.
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad.
    Yan, Bingcheng
    Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad.
    The customer value delivery of online marketplace: Case study of Taobao company2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
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