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We derive a new relation between the metallicity of Seyfert 2 Active GalacticNuclei (AGNs) and the intensity of the narrow emission-lines ratio$N2O2$=log([N II]$\lambda$6584/[O II]$\lambda$3727). The calibration of thisrelation was performed determining the metallicity ($Z$) of a sample of 58 AGNsthrough a diagram containing the observational data and the results of a gridof photoionization models obtained with the Cloudy code. We find the new$Z/Z_\odot$-$N2O2$ relation using the obtained metallicity values and thecorresponding observational emission line intensities for each object of thesample. Estimations derived through the use of this new calibration indicatethat narrow line regions of Seyfert 2 galaxies exhibit a large range ofmetallicities ($0.3 \: < \: Z/Z_{\odot} \: < \:2.0$), with a median value $Z\approx Z_{\odot}$. Regarding the possible existence of correlations betweenthe luminosity $L(\rm H\beta$), the electron density, and the color excessE(B$-$V) with the metallicity in this kind of objects, we do not findcorrelations between them.

New metallicity calibration for Seyfert 2 galaxies based on the N2O2 index