Are air bags legal?

[zammer]

I was wondering if bagging our trucks is legal, I ask this because i need to get a safety inspection done on my truck when I ready to register it due to its age..
I need know if I should put on coils until the inspection is done or can i just go straight to airbags..
It may be different in certain places, but here in Alberta I'm not really sure if it is or not... I know you can have bags on trucks with existing front and rear suspension to help with heavier loads etc...

thanks!