Lightning strikes a field near Iowa City
Lightning strikes a field just west of Iowa City, Iowa, on May 14, 2020. Researchers have found that, while spring rains wash away some pollen, tree pollen fragments can remain airborne for hours after a storm.
[Research supported by U.S. National Science Foundation grant AGS 1906091.]
Learn more in the University of Iowa news story Spring rains: A surprising source of pollen. (Date image taken: May 14, 2020; date originally posted to NSF Multimedia Gallery: Sept. 22, 2020)
Credit: Tim Schoon/University of Iowa
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