  We construct the electromagnetic anomaly effective term for a generalized
linear sigma model with two chiral nonets, one with a quark-antiquark
structure, the other one with a four quark content. We compute in the leading
order of this framework the decays into two photons of six pseudoscalars:
$\pi_0(137)$, $\pi_0(1300)$, $\eta(547)$, $\eta(958)$, $\eta(1295)$ and
$\eta(1760)$. Our results agree well with the available experimental data.
