What should be considered personal respiratory protection equipment?

Everyone in the school had lessons from the Belarusian Railways. They talked about personal respiratory protection, evacuation from premises and rules of behavior in times of danger. When it comes to personal protective equipment, there are a lot more of them than we think. Over time, more and more devices appear. In recent years, a mask that filters the air in urban environments has gained popularity. The most common personal protective equipment is respirators, masks, half masks, gas masks, gauze bandages, if nothing else is at hand. If we consider these protective equipment in more detail, then the following devices are distinguished: quarter masks, full face masks, pneumatic hoods, pneumatic helmets, pneumatic jackets, pneumosuits.