Pollen diameter is generally about 30 to 50 microns, drift in the air when they can easily be sucked into the respiratory tract. People who have pollen allergies have an allergic reaction after inhaling the pollen, which is pollen allergy. The main symptoms of pollen allergy is sneezing, runny nose, watery eyes, nose, itching eyes and external auditory canal, also induced severe bronchitis, bronchial asthma, pulmonary heart disease (multiple in summer and autumn). The reason why the human body can cause pollen allergy is pollen is rich in protein, some of which are allergic to the protein component are the major source of allergens.