If you sit too close to an airbag you can be injured when it deploys. As a driver you should not sit closer than 25 centimetres from the frontal airbag in the steering wheel.
Note that a child must never sit in a child safety device in front of an activated airbag. It is only when the child no longer uses a child safety device and is at least 140 centimetres tall that it may sit in front of an activated airbag.