The report “Ring Test for Immission Measurement 2012” summarises the results of this EQA. Competence in measuring sulphur dioxide (SO2) and carbon monoxide (CO) was tested. The results of all 10 participating organisations have been subjected to the same statistical evaluation methods as those foreseen for the EQLs: according to the “Protocol for intercomparison exercises”, AQUILA document N37. Since February 2010, the Federal Environment Agency has been operating an interlocutory test facility for immission measurements, at which inter-laboratory tests on different air pollutants are carried out at regular intervals.
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