Tree pollen in the D.C. region has spiked way above average not once but twice, in February and April. A lack of much winter is probably part of the cause.
This bout — our true seasonal peak — wasn’t the region’s first dance with explosive tree pollen in 2023.
Instead of a gradual upward glide toward a peak in April, two sharp spikes came during periods when daytime temperatures were running 10 to 20 degrees above average. A dip in March was thanks to a stretch of chillier days that briefly slowed pollen production.As April began, above-average temperatures reasserted themselves while trees were locked and loaded.
While counts remain high heading into the final third of April, most spots locally are on the downswing. You can see this in the oak catkin “tumbleweeds” on street corners and that yellow coating all over surfaces.“The greenish-yellow film that builds up on outdoor car surfaces is a great indicator of when our oaks and the much larger pine pollen has reached peak levels,” Kosisky wrote.
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