https://doi.org/10.1016/S2542-5196(19)30015-4


"12 (71%) of the 17 locations showed significant increases in seasonal
cumulative pollen or annual pollen load. Similarly, 11 (65%) of the 17
locations showed a significant increase in pollen season duration over time,
increasing, on average, 0.9 days per year."

While this addresses windblown pollens that trigger allergies, a bloom is a
bloom is a bloom, so I expect that we can apply these findings to the
insect-pollinated trees.

And as a general rule of thumb, the higher one's (north OR south) latitude,
the larger the annual change.

Good news for allergists, and it seems that we can infer earlier and longer
blooms of plants of value to bees.

Bad news for the climate, though. 

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