Yara's Air1 AdBlue is the first existing licensee to pass the German Association of Automotive Industry (VDA) AdBlue audit programme.
Bert van Tilt, Air1 Director for Europe, said: "We will continue to support the VDA ensuring that the AdBlue audit process is always improved to bring the utmost guarantee of quality product to the end customer from all licensed suppliers."
Tests were completed on its different manufacturing facilities, including its plant at Sluiskil, Netherlands, which is the largest production site for AdBlue in the world, and its distribution and storage network.
The audits are obligatory for all new licensees, further details about the programme can be found here (PDF).
