For the herbaceous species (Poaceae and Artemisia ), the annual pollen integral and peak values showed a decreasing trend.
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Long-Term Pollen Monitoring in the Benelux: Evaluation of Allergenic Pollen Levels and Temporal Variations of Pollen Seasons.
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The sentences
Indeed, statistical tests will in principle be more efficient in highlighting a significant trend if the time series are longer.
Most arboreal species showed an overall trend toward an increase in the annual pollen integral and peak values and an overall trend toward an earlier start and end of the pollen season, which for Betula resulted in a significant decrease in season length.
The season timing of Poaceae showed a trend toward earlier starts and longer seasons in all locations.