MSHA Warns Miners on Hydrogen Sulfide Detection Risks

Arlington, VA — The Mine Safety and Health Administration warned miners on October 7, 2026, that relying solely on sense of smell to detect hydrogen sulfide could lead to serious injury or death. Hydrogen sulfide is a toxic, colorless gas that OSHA calls one of the leading causes of workplace gas inhalation deaths in the United States. The gas can be released into the air during mining operations, according to Safety+Health Magazine.

Exposure Symptoms Listed by MSHA

MSHA states that exposure may cause irritation to the eyes and respiratory system, disorientation, dizziness, headache, fatigue, sensitivity to light, fluid in the lungs, coma, seizures, and possibly death. Hydrogen sulfide is also known as sewer gas, stink damp, swamp gas or manure gas. It can be found in numerous industrial operations, sewers, sulfur springs and volcanic gas.

Sense of Smell Limitations

Miners may initially detect hydrogen sulfide by a rotten egg smell, but the gas can quickly numb the sense of smell, MSHA warns in its health alert. The agency notes this detection method alone is unreliable for protection.

MSHA Best Practices

MSHA recommends ensuring all work areas are well ventilated, especially enclosed areas. Workers should always carry a gas detector when working or traveling in areas that may contain hydrogen sulfide. Appropriate respiratory protection must be used when working in an area that contains hydrogen sulfide, according to Safety+Health Magazine.

The alert was published by Safety+Health Magazine on the Mine Safety and Health Administration guidance.