People are exposed to hydrogen sulfide by breathing air that contains the gas. Hydrogen sulfide levels can be high near manure pits, paper mills, wastewater treatment plants, and other industries that produce the gas. Hydrogen sulfide is often found in sewer gas and can enter homes through dried-out sewer traps or clogged sewer vents. People who work at facilities that produce or use hydrogen sulfide are exposed to higher amounts than the general population. People who live near these facilities may also be exposed if an accidental leak occurs.
Low levels can also inflame the lungs and nasal passages.
Eyes may become sore and watery. Your throat may itch and you may start to cough. Long-term health effects of low level hydrogen sulfide exposure is unknown. At levels above 100 ppm, hydrogen sulfide is very dangerous. The gas loses its odor by overpowering the sense of smell and begins to affect the whole body.