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    Joint Danube Survey

    The key purpose of Joint Danube Surveys (JDS) is to produce reliable and comparable information on carefully selected elements of water quality for the length of the Danube River, including its major tributaries. Three Joint Danube Surveys have previously been conducted, in 2001, 2007, and 2013. The fourth of its kind, JDS4 was launched in June 2019 at sampling sites in 13 countries across the Danube River Basin.