Xinhua News Agency, Beijing, March 18 (Reporter Ni Yuanjin) The pollen concentration forecast released by Beijing Meteorological Bureau shows that at present, cypress, Ulmaceae and Myrtaceae are the main pollen species in Beijing, with high concentration. Experts say that the "culprit" of pollen allergy in spring is often not brightly colored ornamental flowers, but trees and weeds that don’t look like flowers. The meteorological department suggested that when the temperature rises, people with pollen allergy can "look at the sky" for protection when traveling.

　　It is understood that pollen transmission in nature is mainly divided into two forms: "wind vector" and "insect vector". Wind-borne pollen, such as the pollen of cypress, poplar, willow, birch and phoenix tree, is characterized by small flower shape, high pollen content and light weight, which can fly far away with the wind and is the "culprit" of allergic symptoms.

Peach blossoms in full bloom in the Summer Palace (photo taken on March 12). Recently, the peach blossoms in the Summer Palace in Beijing have blossomed, and the strong spring has attracted the public to come and enjoy the flowers. Xinhua News Agency reporter Xin Li photo

　　Li Lisha, an attending physician in the Department of Allergy of Peking Union Medical College Hospital, said that allergic patients with pollen allergy had allergic symptoms in late February, and most patients had severe allergic symptoms in late March.

　　"In Beijing, cypress, poplar and willow mainly spread pollen in March, and birch, phoenix tree and ash tree mainly spread pollen in April and May, which may cause pollen allergy." Li Lisha said.

　　The meteorological department of Beijing suggested that allergic people should try to avoid going out during the high pollen concentration period from 10 am to 5 pm during the high pollen season. In addition, allergic people can "watch the sky" when they go out. The weather with clear breeze and high temperature is conducive to the increase of pollen concentration, and obvious rainfall and wind power above 4 are conducive to the decrease of pollen concentration.

　　Experts pointed out that it is best for allergic people to wear masks and glasses when they go out. If they come into contact with more allergens when they go out, they can clean their noses when they go home. If the allergic symptoms are serious, you can use "pollen blocking agent" to reduce the inhalation of pollen particles, and it is best to carry out drug treatment under the guidance of a doctor.