When the air bags inflate, they make a loud noise and may produce 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 because of the contact of your chest with both the seat belt and the air bag, as well as from breathing the smoke and powder. The powder may aggravate asthma for some people. If you experience breathing problems after an air bag deployment, seek medical attention immediately.
Though the smoke and powder are nontoxic, they may cause irritation to the skin, eyes, nose, throat, etc. If this is the case, wash and rinse with cold water immediately and seek medical attention if the symptoms persist.
Hyundai Kona (OS) 2018-2025 Service Manual: Side Airbag (SAB) Module Components and components location
Components
1. Side Air Bag (SAB)
...
Hyundai Kona (OS) 2018-2025 Owners Manual: Disc brakes wear indicator
When your brake pads are worn and new pads are required, you will hear a high
pitched warning sound from your front or rear brakes. You may hear this sound come
and go or it may occur whenever you depress the brake pedal.
Note that some driving conditions or climates may cause a brake squeal when ...