They are disc brakes, and are going to emit dust. Carbon metallic friction compounds create more noticeable dust, ceramic compounds create less noticeable dust, and organic/semi-metallic compounds are about middle of the road. Gray iron rotors contribute to dusting more than nickel alloyed iron.
They are brakes, and are going to create particles. If they were drum brakes they would still create dust, but contain and deflect more of it inward. You are stopping a probably 4,500 lb. vehicle (empty) and not a 2,300 pound Kia, so more particles are going to be created.