EN17346:2020isaEuropeanStandardthatspecifiesastandardizedmethodfordeterminingammonia(NH₃)concentrationsinambientairusingdiffusionsamplers.Thismethodisdesignedforpassivesampling,whereammoniadiffusesintoacollectormediumoveradefinedexposureperiod,typicallyrangingfromseveraldaystoweeks.Thestandardprovidesguidelinesforsamplerpreparation,deployment,analysis,andcalculationofresults,ensuringconsistencyandreliabilityinmonitoringairquality.Itisapplicableforassessingammonialevelsinvariousenvironments,supportingregulatorycomplianceandenvironmentalhealthstudies.