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The six people who died at a Colorado dairy farm in August were exposed to toxic hydrogen sulfide gas, authorities said on Thursday, citing autopsies and toxicology reports on the deceased.

According to the Occupational Safety and Health Administration (OSHA), exposure to hydrogen sulfide gas at “very high concentrations can quickly lead to death.”

The autopsy reports did not indicate the circumstances of the deaths.

Hydrogen sulfide is colorless, but has a sulfurous smell, similar to rotten eggs. OSHA warns that those who have breathed in enough hydrogen sulfide to become unconscious but survive can still struggle with long-term health effects, such as headaches and poor attention span.

SIX DEAD IN DAIRY ACCIDENT IN RURAL COLORADO PLAINS AR

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