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“They started experiencing headaches, nausea, irritation, shortness of breath, symptoms typically associated with hydrogen sulfide poisoning,” Zehl said. “And so, they went to go get medical ...

Hydrogen sulfide, a colorless gas that smells like rotten eggs, is produced naturally from decaying matter. This gas is lethal to breathe in, and hydrogen sulfide present in high concentrations ...

Officials later alerted that a shelter-in-place order had been placed both Deer Park and Pasadena due to the release of hydrogen sulfide. Deer Park and Pasadena are located east of Houston.

The Permian Basin of West Texas and other oil-production regions are naturally saturated with hydrogen sulfide, a strong-smelling poisonous gas that forms underground as plants and organisms decay.