Why can't the Three North Shelterbelt stop the sandstorm?

Hello, experts from China Meteorological Bureau and other institutions have said that the Three-North Shelterbelt can fix sand, but it can't stop the wind or the dust transported from high altitude. There are also deserts in Central Asia, such as Mongolia, which is one of the cradles of sandstorms.

Reducing dust in Beijing, the Three North Shelterbelt is really working.

On March 28th, Gui Hailin, chief forecaster of the National Meteorological Center, told this newspaper that according to the dust statistics of the Central Meteorological Observatory, the dust weather in Beijing has generally shown a downward trend since 2000. The construction of the Three-North Shelterbelt has a restraining effect on its sand source. In this case, only the farther sand source can affect Beijing. At the same time, due to the reduction of dust supplement along the way, under the same circumstances, the intensity of dust encountered by Beijing will be weakened.