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This European Standard specifies performance requirements and test methods for the evaluation of procedures for measuring metals and metalloids in airborne particles collected on a suitable substrate, e.g. a filter. This European Standard is not applicable to procedures for measuring metals or metalloids present in inorganic gases or vapours, e.g. mercury, arsine, etc (see EN 838 [1] and EN 1076 [2]), or to procedures for measuring metals and metalloids in compounds that could be present as a particle/vapour mixture, e.g. arsenic trioxide (see ENV 13936 [3]). This European Standard is applicable to measuring procedures in which sampling and analysis is carried out in separate stages, but it does not specify performance requirements for collection, transport and storage of samples, since these are dealt with in EN 13205. This European Standard specifies a method for determining the bias and precision of the analytical method and combining this with the bias and precision of the sampling method to estimate the overall uncertainty of the measuring procedure as a whole. If there is no procedure for measuring a particular metal or metalloid which meets the requirements of this European Standard, it is recommended to use a measuring procedure whose performance is nearest to the specified requirements.