This European Standard specifies the sampling of PCDDs/PCDFs. It is an integral part of the complete measurement procedure. The use of the other two parts prEN 1948-2:2005 and prEN 1948-3:2005 describing extraction and clean-up and identification and quantification, respectively, is necessary for the determination of the PCDDs/PCDFs.This European Standard has been developed to measure PCDD/PCDF concentrations at about 0,1 ng I TEQ/m3 in stationary source emissions.This European Standard specifies both method validation and a framework of quality control requirements which shall be fulfilled by any PCDD/PCDF sampling.The user has the possibility to choose be