Health hazards encountered by workers at a granular chemical fertilizer factory in Calgary, Canada were discussed. Potential hazards included corrosive materials, noxious gases, nitrate melts, radioactivity, dusts, welding fumes, and physical agents such as noise, heat stress, and heavy lifting. Some chemicals presented a low potential hazard since there was minimal exposure due to normal operations of the facility. Catalysts used in the manufacturing process were potential hazards to those workers that are removing or installing charges. The phosphate rock used for making phosphoric-acid contained 100 parts per million uranium (7440-61-1). The greatest dose rate in the facility for alpha radiation was 0.12 working level months. The gamma radiation levels were 0.018 to 0.040 milliroentgen/hour. Workers in some areas were potentially exposed to silica (14808-60-7) in phosphate rock dust. The noxious gases that could be encountered during the manufacture of fertilizer were hydrogen-fluoride (7664-39-3) and hydrogen-sulfide. Hydrogen-fluoride and hydrogen-sulfide gases evolved during the production of phosphoric-acid since the phosphate rock contained both fluoride and sulfide.