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 EN 1948-2 and EN 1948-3 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 between three different methods: filter/ condenser method, dilution method, ?cooled probe method.