## 4 Results and Discussion
### Identification of Gaps Related to the Integration of EPD Data in IFC
\begin{table}
\begin{tabular}{l l l l} \hline \hline
**Indicator** & **Name** & **Unit** & **Description** \\ \hline EPD GWP\({}_{\text{total}}\) & Global Warming Potential 1 (GWP 100) & kg CO\({}_{2}\) eq & Baseline model of 100 years of the IPCC. \\ \hline IFC GWP\({}_{\text{total}}\) & ClimateChangePerUnit & IfcMassMeasure & Quantity of greenhouse gases emitted calculated in equivalent CO\({}_{2}\) \\ \hline EPD GWP\({}_{\text{fossil}}\) & GWP fossil fuels & kg CO\({}_{2}\) eq & Baseline model of 100 years of the IPCC. \\ \hline IFC GWP\({}_{\text{fossil}}\) & N/A 2 & & \\ \hline EPD GWP\({}_{\text{biogenic}}\) & GWP biogenic & kg CO\({}_{2}\) eq & Baseline model of 100 years of the IPCC. \\ \hline IFC GWP\({}_{\text{biogenic}}\) & N/A 2 & & \\ \hline EPD GWP\({}_{\text{liuluc}}\) & GWP land use and land use change & kg CO\({}_{2}\) eq & Baseline model of 100 years of the IPCC. \\ \hline IFC GWP\({}_{\text{liuluc}}\) & N/A 2 & & \\ \hline EPD ODP & Ozone depletion potential & kg CFC-11 eq & 1999 WMO assessment of ozone depletion (World Meteorological Organization 1999). \\ \hline IFC ODP & StratosphericOzoneLayer DestructionPerUnit & IfcMassMeasure & Quantity of gases destroying the stratospheric ozone layer calculated in equivalent CFC-R\(11\). \\ \hline EPD AP & Acidification potential & mol H\({}^{+}\) eq & Accumulated Exceedance method (combination of models). \\ \hline IFC AP & AtmosphericAcidificationPerUnit & IfcMassMeasure & Quantity of gases responsible for the atmospheric acidification calculated in equivalent SO\({}_{2}\). \\ \hline EPD & Eutrophication potential, fraction of nutrients reaching freshwater & kg PO\({}_{4}\) eq & CARMEN model for waterborne emissions and EUTREND for airborne emissions. \\ \hline IFC EP\({}_{\text{freshwater}}\) & EutrophicationPerUnit & IfcMassMeasure & Quantity of eutrophicating compounds calculated in equivalent PO\({}_{4}\). \\ \hline EPD EP\({}_{\text{marine}}\) & Eutrophication potential, fraction of nutrients reaching marine end compartment & kg N eq & CARMEN model for waterborne emissions and EUTREND for airborne emissions. \\ \hline IFC EP\({}_{\text{marine}}\) & N/A 2 & & \\ \hline EPD EP\({}_{\text{terrestrial}}\) & Eutrophication potential, accumulated exceedance & mol N eq & Accumulated exceedance method (combination of models). \\ \hline IFC EP\({}_{\text{terrestrial}}\) & N/A 2 & & \\ \hline EPD POCP & Formation potential of tropospheric ozone & kg NMVOC eq & LOTOS-EUROS \\ \hline IFC POCP & PhotochemicalOzoneFormationPerUnit & IfcMassMeasure & Quantity of gases creating the photochemical ozone calculated in equivalent ethylene 3. \\ \hline EPD ADPE & Abiotic depletion potential for non-fossil resources & kg Sb eq & Abiotic resource depletion (ADP ultimate reserve). \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Comparison between the core indicators in EPDs (default characterization method in EN 15804) and the related IFC parameters. It should be noted that different versions of EN 15804 or ISO 21930 define different calculation methods and/or allow the declaration of indicators calculated according to different methodologies. Consequently, the reference to the dated calculation method used for each environmental indicator must be included in the dEPD. In addition, IFC contains properties referring to _old_ standards such as ISO 21930:2007, which has been superseded by ISO 21930:2017. An example is _TotalPrimaryEnergyConsumptionPerInit_, which is described in IFC as \"Quantity of energy used as defined in ISO 21930:2007\". The report [48] proposed the inclusion of additional properties for the impact categories defined in EN 15804+A2, but it has not been implemented in IFC yet. In addition, the proposed terminology should be adjusted according to EN 15804 and ISO 21930. As an example, _GWPtotal_ should be used instead of _ClimateChangeTotal_. IFC represents individual properties and their sets with predefined property types, which reflect the data type of the corresponding property.