Spring rains: A surprising source of pollen

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Spring rains: A surprising source of pollen

Spring rains wash away some pollen Tree pollen remains in the air up to 11 hours after rains
More at https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=300665&WT.mc_id=USNSF_1


This is a Research News item.

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