Fire at SK hynix's Cheongju complex leaves seven injured

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Published: 01 Jun. 2026, 12:18

CHO YONG-JUN
[email protected]

SK Hynix's Cheongju plant in North Chungcheong [NORTH CHUNGCHEONG]

A fire broke out at SK hynix's Cheongju Technopolis industrial complex in North Chungcheong, injuring seven people as of early Monday.

The fire started around 10:32 a.m. in a gas room on the sixth floor of Building 3, according to Yonhap. The fire was brought under control after activating the sprinklers, but hydrogen fluoride, a toxic gas, was leaked at a level of 5 parts per million (ppm).

The 5 ppm reading exceeded the Ministry of Employment and Labor's ceiling exposure limit of 3 ppm.

The United States Occupational Safety and Health Administration's permissible exposure limit of hydrogen fluoride sits at 3 ppm as an eight-hour average.

"Firefighters in protective gear are inside determining exactly what happened," a fire official said. "The number of patients could also rise.

BY CHO YONG-JUN [[email protected]]