This fundamental hydrogen sulfide safety training program provides workers with essential knowledge about H2S hazards, recognition, and safe work practices in environments where this deadly gas may be present. Hydrogen sulfide is an extremely toxic, flammable gas produced naturally during the decomposition of organic materials and as a byproduct in petroleum refining, natural gas processing, wastewater treatment, and various industrial processes. Understanding the properties, hazards, and protective measures for hydrogen sulfide is critical for worker survival in oil and gas operations, refineries, chemical plants, and municipal wastewater facilities. Participants will learn the physical and chemical properties of hydrogen sulfide including its characteristic odor at low concentrations, olfactory fatigue that occurs at higher levels, flammability limits, and vapor density. The course covers exposure limits including OSHA's permissible exposure limit (PEL) of 10 ppm as an 8-hour time-weighted average, the acceptable ceiling concentration of 20 ppm, and the immediately dangerous to life or health (IDLH) concentration of 100 ppm. Workers will understand acute and chronic health effects at various exposure levels, from eye and throat irritation at low concentrations to rapid unconsciousness and death at concentrations above 500 ppm. The training addresses comprehensive respiratory protection requirements including when to use air-purifying respirators versus supplied-air systems, limitations of different respirator types in various H2S concentrations, proper fit testing, and emergency escape respirators for evacuation. Participants learn about continuous monitoring systems, portable gas detectors, alarm setpoints, and appropriate responses when monitors alarm. The course covers safe work practices including confined space entry procedures, atmospheric testing protocols, ventilation requirements, and buddy system protocols. Additional topics include establishing briefing areas and assembly points, escape route planning, emergency contingency plans, rescue procedures that protect rescuers from becoming victims, and medical response protocols for H2S exposure. This essential training ensures workers can recognize H2S hazards, understand monitoring and protection systems, use respiratory protection appropriately, and respond effectively to H2S emergencies in industrial environments where this lethal gas poses a constant threat.