Results of the EQA scheme have been summarised. Competence in the measurement of sulphur dioxide (SO2) and nitrogen oxides (NO and NO2) was tested. The measurement results of all 8 participating organisations have been subjected to the same statistical evaluation methods as those foreseen for the European Reference Laboratories’ ring trials: 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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