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Table 1 SLI values in different years (2013–2017) through different pollen seasons (alder, birch and grass) are shown for the three selected areas within Vienna (“Vienna East”, “Vienna Center” and “Vienna West”) in combination with their respective average for Vienna

From: The connection of pollen concentrations and crowd-sourced symptom data: new insights from daily and seasonal symptom load index data from 2013 to 2017 in Vienna

Region Year SLI/SPIn alder SLI/SPIn birch SLI/SPIn grasses
Vienna Average 2013 2.4/2679 6.4/4517 3.8/3107
Vienna East   2.3 6.2 3.9
Vienna Center   2.4 6.4 3.7
Vienna West   2.6 6.6 3.8
Vienna Average 2014 3.6/2883 5.1/6916 4.1/2031
Vienna East   3.4 4.7 4.1
Vienna Center   3.5 5.3 4.0
Vienna West   4.0 5.3 4.1
Vienna Average 2015 2.8/760 5.6/4992 4.3/3264
Vienna East   2.6 5.6 4.3
Vienna Center   2.5 5.6 4.2
Vienna West   3.2 5.5 4.3
Vienna Average 2016 3.9/2685 5.2/9233 4.2/2522
Vienna East   3.7 5.1 4.2
Vienna Center   4.0 5.3 4.3
Vienna West   4.0 5.2 4.0
Vienna Average 2017 4.1/1477 4.8/3497 4.0/2517
Vienna East   4.0 4.8 3.9
Vienna Center   3.9 4.3 3.9
Vienna West   4.3 5.0 4.4
  1. The SPIn was calculated for the observed time period and is shown for Vienna with the average SLI. The arrows indicate the change of the SLI (left) and the SPIn (right) compared to the previous year. Note the inconsistency between the increase/decrease of SLI and SPIn in most of the cases, especially in the birch and the grass pollen seasons