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　　A collective term for various equipment used by individuals to prevent damage from toxic agents, biological warfare agents, and radioactive dust. Also known as personal defense equipment. There are mainly: gas masks, gas cloaks, gas gloves, and gas boot covers. Gas masks are used to protect respiratory organs, eyes, and face from toxic substances such as toxins, biological warfare agents, and radioactive dust. Gas masks can be divided into two types based on different protection principles: filter type and isolation type. According to the protection principles of these two types of masks, special gas masks can also be manufactured, such as rocket propellant masks, tank crew masks, and casualty masks. Anti toxic clothing is used to protect the whole body and prevent toxic substances such as toxins, biological warfare agents, and radioactive dust from causing harm through the skin. A gas cloak is used to prevent toxic substances such as droplets, biological warfare agents, and radioactive dust from passing through the skin and causing air damage. Anti gas vests and cloaks are usually used in conjunction with gas masks, gloves, and boot covers. Antivirus gloves and boots are used to protect hands and feet. In addition, personal protective equipment such as dosemeters, drug detection paper, disinfection kits, first aid drugs, and automatic injection gas are also provided for personal use. Proficient use of personal protective equipment can effectively reduce the casualties of troops in nuclear, chemical, and biological attacks, ensuring that the troops carry out combat tasks in contaminated environments.