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.
2. Bacterial and viral pneumonia will give you more frothy yellow phlegm and excessive throat mucus; it is a very serious condition that should not be taken lightly. 3. Coughing up yellow mucus could be a sign of chronic bronchitis caused by smoking or hazardous work environment like coal mines or chemical factories.