Possible implications of the variability of the most allergenic plant pollen seasons in Poland.

One of the first cross-sectional studies performed in European aerobiological stations showed a clear trend towards higher birch pollen concentrations, probably related to air altitude 59 – 61 .

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The analyses of the threshold values adopted from the Standards of Polish Allergology 48 , indicated an increasing trend in the number of days with alder pollen concentrations above 80 Pollen m − 3 in Krakow and Lublin, and with grass pollen concentrations above 50 Pollen m − 3 in Wrocław (Table S3).

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