Final answer:
A Gas mask is designed to protect against chemical and biological agents. It offers more protection compared to surgical, dust, or N95 masks, especially for individuals working with BSL-4 agents or handling hazardous chemicals like chlorine.
Step-by-step explanation:
The type of mask that protects you from chemical and biological agents is a Gas mask. These masks are designed to filter out harmful agents in the air, including both chemical and biological substances. For example, during World War I, soldiers were issued gas masks as part of their kit to protect against chemical attacks, which were greatly feared due to their invisible and often sudden nature. In modern-day scenarios, individuals working with BSL-4 agents, such as Ebola virus, in high-containment labs or handling toxic chemicals like chlorine would use specialized protective suits with a dedicated air supply, similar to those depicted in Figure 13.2. These suits maintain positive air pressure to prevent laboratory air from entering the suit in case of a leak, providing a high level of protection against potential exposure. Surgical masks, dust masks, and N95 masks do not offer the same level of protection against chemical or biological agents as gas masks and full protective suits do.