The National Highway Traffic Safety Administration did some testing back in July and found many of those recalled airbags exploded.
See also: What to do if your Takata airbags are recalled
Researchers say airbags that were more "prone to exploding" came from humid states like Texas.
Click here to check if your vehicle is part of the recall
In August, airbag maker Takata confirmed a truck carrying its inflators and a volatile chemical exploded in a Texas border town, killing a woman and injuring four others.
The truck crashed, caught fire and exploded on August 22 in Quemado, about 140 miles from San Antonio.
The explosion was so strong, it leveled the woman's home.