At the partners in community forestry conference there was lots of discussion about tree pollen allergies. In a discussion I had after the conference, a plant specialist stated that the yellow pollen released by pine trees is too large to impact most humans. Most doctors do not test for it in the allergy test. It is mostly the very small pollen invisible to the human eye that creates human reactions, and it turns out that the pollen counts are acerbated by the selling of male plants in urban areas, which it turns out most people prefer because they are not messy or smelly (many female trees produce fruit and occasionally an odor). It should also be stated that the pollen is often produced not by trees but small plants like ragweed.
Photo by Tobi Ames