A hydrogen sulfide leak occurred at the HD Hyundai Oilbank Daesan plant.
According to fire authorities on the 27th, a 119 call came in at about 9:45 p.m. reporting that two workers in their 20s inhaled hydrogen sulfide at the HD Hyundai Oilbank Daesan plant in Daesan-eup, Seosan, South Chungcheong.
Fire authorities said they transported them to hospitals in Dangjin and Cheongju, North Chungcheong. Both workers were said to be in no life-threatening condition.
Hydrogen sulfide is a colorless, foul-odor gas that smells like rotten eggs and is classified as a toxic gas that can cause asphyxiation if inhaled.
Fire authorities and police believe a pressure valve on the equipment partially opened during work, causing the leak, and are determining the exact circumstances of the accident by interviewing plant officials.