  We propose a model of suppression of $\pi^0$'s based on two different
effects: at low $p_T$ we take into account the shadowing corrections, while at
large $p_T$ the suppression is produced due to the interaction of the large
$p_T$ pion with the dense medium created in the collision. The main features of
the data on $AuAu$ and $dAu$ collisions are reproduced both at mid and at
forward rapidities.
