Summary
Airborne pollen studies were carried out, by means of Burkard volumetric spore traps, at two different sites (the city of Stockholm and the suburb Huddinge) 15 km apart in the Stockholm region. Within the city of Stockholm the study was carried out in 1973–89 while in Huddinge the investigation period was 1977–82. In all the years under investigation the total pollen catch and the number of pollen types were higher in Stockholm than in Huddinge. The reason for this is not explained by the composition of the local vegetation surrounding the traps. It is concluded that parameters such as qualitative changes in the daily catches and occurrence during the main pollen season are more important than the absolute daily figures. The cyclic trends in the local annual sums over a long period of years do not show any periodicity that is altogether regular and reliable.
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El-Ghazaly, G., El-Ghazaly, PK., Larsson, KA. et al. Comparison of airborne pollen grains in Huddinge and Stockholm, Sweden. Aerobiologia 9, 53–67 (1993). https://doi.org/10.1007/BF02311371
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DOI: https://doi.org/10.1007/BF02311371