Adaptation to impacts of climate change on aeroallergens and allergic respiratory diseases.

Int J Environ Res Public Health · 2010 · PMC2954564 · PMID 20948943

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a clear trendno p-value reported

A clear trend in the timing of the end of the pollen season, and therefore the overall length of the pollen season, has not been found.

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an increasing trendno p-value reported

Many of these records show an increasing trend in pollen concentration for important allergenic species such as birch ( Betula ) (e.g., Yli-Panula et al .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.