The introduction of airbags in cars varied by country and car model, but in general, airbags became more common during the 1980s and early 1990s. Some high-end car models introduced airbags in the late 1970s, but it wasn't until the 1990s that airbags started to become more widely available.
If you want to know for certain whether a specific 1991 Volvo 740 has airbags, you can check the car's owner manual or contact a local Volvo dealer. They should be able to provide you with information on the specific safety features of that particular vehicle.
