Which of the following is considered a hazardous material?

Compressed gases are considered a hazardous material because they can pose significant safety risks during transportation and handling. These gases can be flammable, toxic, or reactive under certain conditions, making them a potential danger to both postal workers and the general public. Proper identification, packaging, and handling procedures are essential when dealing with compressed gases to prevent accidents, such as explosions or leaks, which could result in serious injuries or harm.

In contrast, the other options—paper products, food items, and plastic packages—do not typically carry the same level of risk associated with hazardous materials. While they may require specific handling or packaging methods for efficiency or safety, they are generally not classified as hazardous in the way compressed gases are. This classification is critical to ensuring the safety of postal operations and complying with regulations regarding hazardous materials.