TOKYO — Mazda is expanding its U.S. recall for Takata air bags that may explode to the entire country, following Japanese rival Honda in the decision.

Mazda Motor Corp. said Wednesday it will officially notify the U.S. National Highway Traffic Safety Administration soon, but was still compiling details including the exact vehicle numbers requiring recall.

NHTSA is demanding nationwide air bag recalls. The recalls have concentrated on regions with high humidity, which is suspected as factor in the explosions.

So far the Mazda recalls for driver side air bags total about 87,000 vehicles. Making the recall nationwide would likely lift that number to 330,000 vehicles.

Japanese supplier Takata Corp. is under fire for air bag inflators that can explode, shooting out metal and plastic pieces. At least five deaths and dozens of injuries have been linked to the problem worldwide.

Takata has refused the NHTSA demand for nationwide recalls, although it has said it will cooperate with automakers who decide to do them.

Honda Motor Co. said this week that it will comply with the NHTSA demand, adding 2.6 million more vehicles to its recall, which will now total 5.4 million vehicles.