For the US, more details will likely come late next week.

Honda's global Takata airbag inflator recall will soon expand by an additional 21 million vehicles. The latest increase in the campaign's size will take the automaker's total affected population to around 51 million vehicles across the globe, according to The New York Times.

Honda has not yet said specifically where these newly recalled vehicles are or which models are in need of repair. Honda of America spokesperson Chris Martin tells Motor1 that for the U.S. market the company needs to receive Takata's Defect Investigation Report and then tell the National Highway Traffic Safety Administration what vehicles require fixing. "Once NHTSA acknowledges our recall notification, we will send out a recall statement with available details. I'd expect that to happen some time late next week," Martin said.

On May 4, NHTSA announced it would require Takata to recall an additional 35 million to 40 million inflators in the U.S. The safety agency also requested automakers first to repair the oldest vehicles in the most humid areas. These newly added inflators don't have a desiccant, which is a substance that absorbs moisture. Takata's inflators use ammonium-nitrate propellant. Long-term exposure to humidity can result in the chemical igniting too quickly, which causes the inflator to burst. If there's no drying agent inside, the ruptures could be even more likely, especially in regions with abundant moisture.

Source: The New York Times

Gallery: Takata airbag recall could affect 100 million cars