The annoying willow catkins always strike in April when the spring flowers were in full bloom and the trees were turning green. It is like "snowing in April". According to the "Forecast of the Beginning Period of Willow Catkins in Beijing in 2021", the catkins period in Beijing generally lasts from early April to late May, for about 50 days.

People who are sensitive to catkins can go outdoors in the morning, evening, or after the rain when there is less catkins, or reduce the frequency of going out appropriately. When going out, it is necessary to take protect measures such as wearing masks and glasses before going out to prevent the catkins from irritating the respiratory tract. When you return home, it is recommended to wash your hands and clean your nose and mouth to prevent catkins from sticking to your face, causing allergies, or irritation to the respiratory tract, leading to respiratory diseases such as asthma.

In particular, due to the dry weather in spring, the catkins are also one of the important reasons for fire disasters. The fluff on the surface of the catkins is fully combined with the oxygen in the air. When encountering an open flame, it will immediately cause scorching, and the spread speed is extremely fast. Catkins are flammable substances, which are very light and always drifting in the wind. They can easily cause a series of fires. In addition, some children have weak awareness of fire prevention, and some adults often leave cigarette ends carelessly. Catkins can easily be ignited and become a fuse. Therefore, the catkins should not be ignited during cleaning. Water should be sprayed to moisturize the catkins, and then the catkins should be swept and cleaned to prevent regaining flammability after the water evaporates.