Environmental issues in Tajikistan, include concentrations of agricultural chemicals and salts in the soil and groundwater, poor management of water resources, and soil erosion. Additionally, because of inadequate sanitation facilities, untreated industrial waste (particularly from aluminum production) and sewage combine with agricultural runoff to cause water pollution in the Aral Sea Basin. Soviet-Era mining operations in Tajikistan extracted and processed uranium, gold, antimony, tungsten, mercury, and molybdenum, each of which is known to leave toxic waste that also threatens water quality. Pockets of high air pollution caused by industry and motor vehicles have resulted in Tajikistan ranking 133rd in the world in greenhouse gas emissions. Air pollution is a particular problem during t