Which of the following substances can be categorized as a chemical hazard?

Coal dust is categorized as a chemical hazard because it is a particulate matter formed when coal is mined, processed, or burned. It contains various chemicals and compounds, such as silica and other heavy metals, which can pose significant health risks upon inhalation or contact. Prolonged exposure to coal dust can lead to respiratory diseases, including coal workers' pneumoconiosis, commonly known as black lung disease.

Understanding chemical hazards is crucial in workplace safety, as it involves recognizing substances that can cause harm through chemical reactions, toxicity, or corrosive properties. In contrast, noise pollution is more of a physical hazard, excessive heat is a thermal hazard, and biological agents refer to pathogens or organisms that can cause health issues. Each of these is important to address in a comprehensive safety program, but coal dust distinctly fits the definition of a chemical hazard due to its composition and health implications.