You can use Emuparadise to find and download the best PS2 emulator for Mac and then install it to play PS2 games. There are programs designed specifically for Mac PCs and those emulators work quite smoothly.
The PS2 emulators are also available for Apple PCs and iOS devices (iPad and iPhone). When Windows users are enjoying all kinds of PS2 games on their PCs, the Mac users cannot wait too long.