Does my MacBook air have dual voltage capabilities

The AC adapter can operate on either 110 volt or 220 volt systems and switches automatically. Is this what you are asking?

If you look at the charger's 'brick', it says that it will operate from 100v to 240v and 50Hzto 60Hz. All you need is a proper AC plug/converter for where you may be in the world.

Ciao.