In Europe, the European Directive on ambient air quality and cleaner air for Europe emphasizes the importance of employing standardized measurement techniques and uniform criteria for the number and placement of monitoring stations. While ICP-MS and AAS are mentioned, there is no reference to XRF as no European Standards (CEN) or International Standards (ISO) exist. This ensures that the data collected on air pollution is both representative and comparable through the Community. The directive also recognizes the potential use of methods for in-situ measurements to evaluate ambient air quality. Consequently, it is imperative to establish criteria governing the usage of such techniques and the accuracy standards they must meet. The European standard EN 14902:2005 'Standard method for the measurement of Pb/Cd/As/Ni in the PM10 fraction of suspended particulate matter" is nowadays the only available and specifies both sampling and analysis requirements referring to Graphite Furnace AAS (GFAAS) and ICP-MS as the reference techniques . ICP-MS has a lower detection limit with respect to AAS . Both techniques require sample treatment with nitric or hydrochloric acid , for the acidification of liquid samples or solubilization of solid. These procedures are time-consuming and may introduce potential sources of error. The potential of EDXRF to be equivalent to GFAAS and ICP-MS for the determination of elements in PM10 filters was evaluated by the Joint Research Centre of the European Commission, but it was never included in a standard method . On the other hand, in the US, the EPA already included XRF in the Compendium of Methods for the Determination of Inorganic Compounds in Ambient Air since 1999 . In the last few years, there has been an increased interest in XRF for the analysis of PM, likely due to several advantages it offers over the other standardized techniques and the growing focus on aspects of green analytical chemistry (see Fig. ). Indeed, the simultaneous multi-element capability of modern XRF instrumentation, combined with improved automation, provides a distinct advantage with respect to sequential analysis of each element. This enables quick results, efficient data collection, and analysis, making XRF a unique tool also for screening of PM filters compositions. An increased interest in XRF analysis can also be attributed to the growing emphasis on green analytical chemistry, which seeks to minimize environmental impact and promote sustainable analytical practices . This advantage is particularly beneficial in environmental monitoring studies where a large volume of samples needs to be processed within a limited timeframe, without the need for extensive sample preparation and destruction, and reduced consumption of dangerous compounds to be specifically disposed at the end of the analysis. This manuscript presents XRF based methods to obtain elemental concentration in PM mass.