<p>Aromaticity is one of the most emblematic concepts in chemistry, with benzene as its archetypal molecule, whose structural features are found in a wide variety of compounds. However, the definition of an unequivocal aromaticity scale is still an active field. Here we show how, by comparing Localization-Delocalization Matrix (LDM) descriptor obtained from electronic structure calculations with formal LDM systems, it is possible to quantify the aromaticity of 6-membered ring systems, both as parts of more extended networks and as substituted benzenes. In particular, we set reference systems based on the ideal population scheme of a fully delocalized system as well as of a more general electron-gas system. Results show that, using the Frobenius distance, it is possible to obtain values in agreement with simple aromaticity measures across these two series, indicating that the use of a reference electron-gas structure is feasible. This paves the way for considering aromaticity not only as a local property of benzene moieties in molecules but also as a property of entire systems.</p>