Meteorological conditions, climate change, new emerging factors, and asthma and related allergic disorders. A statement of the World Allergy Organization.

World Allergy Organ J · 2015 · PMC4499913 · PMID 26207160

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an increasing trendno p-value reported

Recent analysis of a continental-scale pollen data set reveals an increasing trend in the yearly amount of airborne pollen for many but not all taxa in Europe, which is more pronounced in urban rather than semi-rural/rural areas.

also in 63,971 other papers

a decreasing trendno p-value reported

The analysis of the time series of aerobiological data from the United Kingdom, the longest of the world, showed a decreasing trend in terms of yearly grass pollen counts and severity of pollen season and an earlier start of the season.

also in 47,180 other papers

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.