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.
People with tree pollen allergies sometimes assume that trees with colorful flowers -- like apple or cherry trees -- will trigger symptoms. In fact, flowering trees usually have bigger, stickier pollen that doesn't blow in the wind or cause symptoms.