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.
Pollens spread by the wind. Pollen from trees, grasses, and weeds are the main cause of allergies. Spring is not the only allergy season, many plants pollinate year round. Your location will determine the time and duration of your pollen season. Pollen counts will vary from day to day as well as hour to hour. Different Pollens for Each Pollen Season . In springtime, pollen from the trees begins its release between January and April, depending on the climate and location. These trees include elm, pine, birch, ash, hickory, poplar, and cypress to name a few. Summertime is when grass pollen reigns supreme: pollen from northern grass in colder climates, such as timothy, rye, and blue; and southern grass pollens in the warmer climates, such as Bermuda Grass.