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The central Asian region of the former USSR, now Turkmenistan, Tadzhikistan, Uzbekistan and Kasakstan, is also an area of active wind erosion. The frequency of dust storms per year in this region. In the vicinity of the Aral and Caspian Seas (Kasakstan, Turkmenistan, Uzbekistan and Tajikstan), dust storms are very frequent. The number of dusty days increases from the forested steppe and steppe zone toward the deserts of central Asia, reaching on an average 40 to 50 a year in Turkmenistan, with the maximum exceeding 80 days per year at some locations. In northern Kasakstan and central Asian region of southern Russia, dust storms are still quite frequent, occurring about 20 times a year.
(Shao, 2000)