Edit. After Black September's assassination of Israeli athletes at the Munich Olympics in 1972, Prime Minister Golda Meir okays a black-box operation to hunt down and kill all involved.
Yellow pollen is produced by evergreen trees, primarily pine trees, including spruce, true cedar trees, fir trees, larch and hemlock. Although yellow pollen looks like it could cause an allergic reaction, in reality it does not trigger allergy symptoms at all. It can stain the skin and clothing, however.
Tree pollen is one of the more common causes of allergy symptoms, particularly in spring. The majority of trees release their pollen in late winter or early spring. Tree pollens that trigger allergies in people are usually very powdery and fine. The wind has the ability to carry tree pollens for miles.