Close, but no cigar.
Citreon's trade-mark suspension system is not air based, but Hydropneumatic, that is its fluid based and not air based. It was also used as long ago as the 1950's, first on the Traction Avant (just at the rear) and then on the DS (front and rear) and has featured on a wide range of Citreon models to this day, I have owned a few different Citroen models with this very system.
Air suspension is far simpler to manufacture, but not as effective. As a side note Citreon do licence the system to a number of manufacturers, including in the past Rolls Royce who used it in addition to traditional spring/damper layouts.
More info here
http://en.wikipedia.org/wiki/Hydropneumatic
Regards
Scaff