Takata is the only major airbag maker that uses the compound in its driver and passenger-side airbags. It has been barred by auto safety regulators from entering into any new contracts for airbags that use ammonium nitrate without a drying agent. Still, automakers remain free to equip model years already in production with the defective Takata airbags, including a version of the airbag that does not contain a drying agent.