The Washington Post

Tree pollen spikes to March record high


Average daily tree pollen count in 2012 each week during February and March compared to average... (U.S. Army Centralized Allergen Extract Lab)
Wow...our tree count has surged into the VERY HIGH range, courtesy of area oak pollen and host of other trees at 2123.96 grains/cubic meter. The oak constitutes some 67% of our total annual tree pollen yield and when the oaks start flowering our tree count shoots up. This looks to be the highest March reading 1998-2011 for tree pollen due to an early oak surge this year.

The count of about 2,124 is almost a four-fold increase from yesterday’s count of 568 grains / cubic meter. The highest tree pollen count on record is 4,539, set April 25, 2009. April tends to have the highest counts of any month.

Jason is the Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science, and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.

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