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.
Common or popular types of tree pollen which can affect your sinuses are: 1  Box Elder is a short lived tree and can be up to 20 meters. It flowers in the early spring before the leaves appear.  Grey Alder grows up to 20 meters.