Out of State: You must have your vehicle tested and registered within 30 days.

If you have just moved to one of the 13 covered counties* from a Georgia county where emission testing is not required and your vehicle has a current Georgia registration, a valid emission certificate will not be required until your registration renewal due date.

*Cherokee, Clayton, Cobb, Coweta, DeKalb, Douglas, Fayette, Forsyth, Fulton, Gwinnett, Henry, Paulding and Rockdale.
http://www.cleanairforce.com/motoris...iontesting.php