An international team of scientists is studying the problem of pollution and dust in Asia. One hundred thirty scientists from twelve countries have gathered in the western Pacific area to observe thick dust storms. They will observe the dust storms which they mix with some of the world's heaviest 【M1】 ______ pollution. The thickest dust storms in recent years reported in Beijing, China and other Asian cities last spring. 【M2】 ______ The dust storms come from deserts in China and Mongolia. 【M3】 ______ This year, similar dust storms have began moving east 【M4】 ______ toward large Asian cities and the northwest Pacific Ocean. The dust storms happen in winter over deserts high 【M5】 ______ below sea level. In the spring, the storms trove east, over large dries in China, Japan and Korea. By summer, rainstorms break up the dust and help increase pollution in the air. 【M6】 ______ The scientists plan observe the dust storms through the 【M7】 ______ middle of May. They are using research ships, airplanes, satellites and instrument on the ground to gather information. 【M8】 ______ Aerosols(悬浮颗粒) are very small particles in the air. The scientists are studying aerosols that contain sulfate(硫酸 盐) and carbon are produced by the burning of soft coal, wood 【M9】 ______ and plants. Barry Hubert of the University of Hawaii is the leading investigators for the study. He says developing nations in Asia 【M10】 ______ use a mixture of fuels that are not used in other areas. 【M1】