According to the Globally Harmonized System of Classification and Labeling of Chemicals, chemicals should be classified according to their physical hazards, environmental hazards, and:

The Globally Harmonized System of Classification and Labeling of Chemicals emphasizes the importance of clearly communicating the hazards associated with chemicals to ensure safety for both humans and the environment. This system recognizes three primary categories of hazards: physical hazards, environmental hazards, and health hazards.

Health hazards pertain to the adverse effects that chemical substances can cause to human health, including toxicity, carcinogenicity, reproductive toxicity, and other long-term health effects. Proper classification of health hazards is crucial for informing users about the potential risks involved in handling and using these chemicals, enabling them to take appropriate precautions.

The other categories mentioned, such as olfactory hazards, radiation hazards, and biological hazards, do not fall under the established framework of the Globally Harmonized System. While these types of hazards may be relevant in specific contexts, they are not part of the classification criteria outlined in the system, which focuses primarily on physical hazards, environmental hazards, and health hazards. Thus, the inclusion of health hazards is essential for comprehensive risk communication and safety management.