Analysis of changes in Betula pollen season start including the cycle of pollen concentration in atmospheric air.

PLoS One · 2021 · PMC8382167 · PMID 34424936

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a clear trendno p-value reported

A clear trend towards an earlier start of the Betula pollen season has been found in different parts of Europe: in Denmark [ 18 ], in London, Brussels, Zurich, and Vienna [ 19 ], in the Netherlands [ 20 ], in Switzerland [ 4 , 21 ], in Reykjavik, Derby, and Sofia [ 22 ] as well as in Bavaria [ 23 ].

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