Sunrise, April 15, 2015 at Jackson’s Flank Attack ( Theresa Rasmussen via Flickr )

Tree pollen levels exploded Saturday and (before the storms) Monday, and may have achieved their highest level of this season.

Susan Kosisky, chief microbiologist at the U.S. Army Centralized Allergen Extract Lab explains (bold text indicates author’s added emphasis):

With the warm temps and breezes on Saturday, our tree count climbed to 1647 grains/cubic meter. We had a slight reprieve on Sunday, however, [Monday] the trees unloaded. The yellowish-green film on the cars yesterday said it all. Our count with rising temps and breezes was 2359.11 grains/cubic meter which is VERY HIGH.

Should Monday’s 2,359.11 count be the highest of the spring, it will rank as the seventh highest (peak) since 1998 and the second highest in the last 5 years.

(Susan Kosisky)

“Oak pollen, which is very high, is the main contributor at 1840 grains/cubic meter,” Kosisky added. “Ash, sycamore, sweet gum, pine, birch and beech are also adding to the count in a big way. This might have been the highest count we will see this tree season. ”