Chemical hazards include volatile organic compounds (VOCs), chemicals and solvents that create inhalation and skin contact risks. Heavy metals and toxic substances require specialized sampling and analysis while pesticides and agricultural chemicals demand expertise in complex exposure pathways. Biological hazards include airborne pathogens and infectious agents in healthcare environments, plus mold and bacterial contamination in industrial settings. Particulate hazards involve asbestos and mineral fibers that create serious long-term health risks, silica dust and metal particles from manufacturing operations, and combustion products and fumes from industrial processes. Each hazard type requires specific monitoring protocols, sampling methods, and analytical techniques to accurately assess worker exposure levels.