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Pollen is known as the second most common allergen followed by house dust mite in Korea. It causes hay fever. asthma and allergic conjunctivitis in a susceptible person. To understand the regional distributions and seasonal variations of the pollen is desirable because the best way to control pollinosis is to avoid exposure to pollen. The Koreaa Academy of Pediatric Allergy and Respiratory Diseases(KAPARD) have accomplished the nationwide studies on allergy plants and their pollens since 1996. This book is written for the people who are suffered and tormented by these plants. Allergy plants grow abundantly where the natural environments are destroyed by human activities such as construction sites, roadways, and the edges of cultivated fields. These allergy plants are not easily noticed because they seldom have prominent flowers. It is impossible not to be exposed by allergenic plants even in the big cities because pollen can spread to many miles by the light wind. However avoidance of pollens. even if impractical, is very important as the intensity of the allergic reaction correlates with the amount of exposure. This book will help the allergic sufferers to understand the cause of their misery. the allergy plants. Botanical words are avoided. if possible, but scientific names are often used to identify the allergenic plants for certainty.