When the air bags inflate, they make a loud noise and they leave smoke and powder in the air inside of the vehicle. This is normal and is a result of the ignition of the air bag inflator. After the air bag inflates, you may feel substantial discomfort in breathing due to the contact of your chest with both the seat belt and the air bag, as well as from breathing the smoke and powder. Open your doors and/or windows as soon as possible after impact in order to reduce discomfort and prevent prolonged exposure to the smoke and powder.
Though smoke and powder are nontoxic, it may cause irritation to the skin (eyes, nose and throat, etc.). If this is the case, wash and rinse with cold water immediately and consult the doctor if the symptom persists.
WARNING

How does the air bag system
operate
Do not install a child restraint on the
front passenger’s seatKia Cee'd JD Service Manual: Coolant Repair procedures
Replacement And Air Bleeding
Never remove the radiator cap when the engine is hot. Serious scalding
could be caused by hot fluid under high pressure escaping from the radiator.
...
Kia Cee'd JD Owners Manual: Air bag warning light
This warning light will illuminate for
approximately 6 seconds each time you
turn the ignition switch to the ON position.
This light also comes on when the SRS
is not working properly. If the air bag
warning light does not come on, or continuously
remains on after operating for
about ...