Geography of Uzbekistan Kazakhstan, also yielded about 60% of the total volume of Central Asia's emissions of harmful substances into the atmosphere. Because automobiles are relatively scarce, automotive exhaust is a problem only in Tashkent and Farghona. The reduction of water in Uzbekistan has resulted in soil degradation, and the spread of the salt from the evaporated Aral Sea has contaminated the surrounding soil. The soil has lost much of its water due to the increased surface irrigation. The irrigation of farmlands with water from the Aral Sea has resulted in increased salinization of the soil, causing the farmland to be less productive
Transport in Uzbekistan of inland waterways. Since the mid-1990s, commercial travel on Uzbekistan's portion of the Amu Darya has been reduced because of low water levels. As of 2010, Uzbekistan had 10,253 kilometers of natural gas pipelines, 868 kilometers of oil pipelines, and 33 kilometers of pipelines for refined products. As of 2012, Uzbekistan has 53 airports. 33 of them have paved runways, six of which had runways longer than 3,000 meters. The largest of them, Tashkent International Airport, is linked with European and Middle Eastern cities by direct flights of Aeroflot, Lufthansa, and Turkish Airlines, and with New York and Los Angeles