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What happens after a crash?

 
The airbag deployment is normally accompanied by the release of dust-like particles in the vehicle's interior. Most of this dust consists of cornstarch or talcum powder, which is used to lubricate the textile cushion deployment. In older systems, small amounts of sodium hydroxide may initially be present at deployment. This chemical can cause minor irritation to the eyes and open wounds; however, with exposure to air, it quickly turns into sodium bicarbonate (common baking soda). Depending on the type of air bag system, small particles of potassium chloride (a table salt substitute) may also be present.

For most people, the only effect the dust produces is some minor irritation of the throat and eyes. Generally, minor irritations only occur when the occupant remains in the vehicle for extended periods of time with no ventilation.
Once deployed, the airbag cannot be reused and should be replaced by an authorized service department. Because airbags only deploy once, do not drive the vehicle until they have been replaced.
Source: NHTSA