H2S Exposure

DID YOU KNOW?

The human body produces small amounts of H₂S to regulate cell function — but in high concentrations, it becomes a deadly poison. ^[3]

KNOW THE RISK

• Hydrogen sulfide (H₂S) is a colorless gas that smells like rotten eggs — but in high concentrations, it quickly deadens your sense of smell. ^[1]
• At levels below 100 ppm, H₂S causes nausea, headaches, eye irritation, and coughing. These symptoms can occur even with short-term exposure. ^[1]
• Above 100 ppm, H₂S can be instantly fatal. A single deep breath at high concentrations may cause immediate respiratory paralysis. ^[1]

MITIGATE THE RISK

1. Follow OSHA Requirements for Confined Space Entry

• Always test for H₂S before entering confined spaces and have a rescue plan in place. Ventilation and monitoring are critical. ^[2]

2. Use Respiratory and Other PPE

• If H₂S levels can exceed exposure limits, wear appropriate respirators and protective clothing. Don’t rely on your nose — rely on detectors. ^[2]

3. Provide Respirator Training and Fit Testing

• When respirators are required, OSHA mandates that employers provide proper training, fit testing, and maintenance procedures. This ensures protection is effective. ^[2]

HAZARD REMINDER

Hydrogen sulfide is fast-acting and often undetectable once you're already at risk. Don’t assume you’ll smell danger — monitor, protect, and follow protocols every time.

REFERENCES

1. OSHA – H₂S Hazards
2. OSHA – H₂S Evaluation and Controls
3. Wikipedia – Hydrogen Sulfide