Public transportation from Abu Dhabi Airport, you can rent a car, take a taxi (outside of Arrivals halls T1 & T2) , or take a bus:  Inter-terminal suttles run every 15 minutes stopping outside Terminal 1 at upper curbside in front of Entrance 5; and at Terminal 2 in front of Departures.
    Public Bus A1 (green & white) runs every 40 mins to the city and takes aut 45 minutes. It departs from the lower curbside of Terminals 1, & 3 and outside of Terminal 2.  It makes stops along the way to the city, passing by Bus Stand at Muroor & Street 11 and terminating at Old Fish Market on Al Nasr Street (near NYU Abu Dhabi). 
    Etihad Airways provides its customers with free bus coaches between Dubai & Abu Dhabi Airport (tel: 04 3216471 or 3216473) or visit:  etihadairways.com.

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