Carbon dioxide, sulfur dioxide, and chlorine are examples of:

The answer is accurate because carbon dioxide, sulfur dioxide, and chlorine are indeed classified as nonfire gases and vapors. These substances are typically produced during various chemical processes and can exist in gaseous form under normal atmospheric conditions.

Carbon dioxide, for instance, is often a byproduct of combustion but is not flammable itself. It is commonly used in fire suppression systems as it can displace oxygen, thus suffocating a fire. Similarly, sulfur dioxide is a gas that can result from the burning of fossil fuels and is known for its adverse effects on health and the environment. Chlorine is primarily used in water treatment and is also not flammable; it can even support combustion by reacting with other materials.

Understanding the classification of these gases is critical for firefighters, as it influences how they approach situations involving hazardous materials. Proper knowledge of these gases helps in making informed decisions on safety, protective measures, and effective firefighting strategies. In contrast, combustible materials, fire retardants, and flammable liquids refer to different categories of substances that have different behaviors when exposed to heat or flame.