Evaluating the relationship between occupational exposure to specific contaminants and adverse health effects, especially in relation to certain chronic diseases in many different industries, including public safety (firefighting), agriculture, and mining. Comprehensive exposure assessment methodologies that design data interpretation and develop the exposure model. Exposure assessment, Statistical model, Health effects, Cancer, Exposure sciences, Air contaminants, Bioaerosols, Occupational Health, Industrial hygiene, Biomarkers.