A battery production facility in Ulsan, specifically DN Automotive, is facing allegations that it attempted to hide the health status of workers who were exposed to heavy metals, particularly lead. One worker, identified only as Mr. K, has reportedly undergone chelation therapy after tests revealed elevated levels of lead in his blood, raising serious health concerns. Mr. K expressed frustration over the lack of clear communication regarding his health and treatment, which included receiving vitamin injections due to prior elevated lead levels. The situation has called into question the factory's protocols surrounding worker health and safety, especially given the nature of their work involving hazardous materials.

On July 25, labor unions representing workers at the DN Automotive Ulsan plant held a press conference alleging that the factory is manipulating health assessments to avoid regulatory scrutiny by the Korean Ministry of Employment and Labor. Special health examinations are mandated to be conducted in designated hospitals, with test results required to be submitted to the ministry within 30 days. Workers with blood lead levels above a specific threshold necessitate post-management care, leading the union to suggest that the factory was taking measures to keep lead levels artificially low to escape oversight.

Union representatives analyzed health examination results from 115 workers who consented to participate in special health assessments from 2022 to the previous year, revealing that a significant number tested with blood lead levels above acceptable limits. They reported that among the 350 workers at the facility, 99 had levels exceeding 10 μg/dL, with 41 falling between 20-24 μg/dL and 22 exceeding 25 μg/dL. The union criticized the failure of adequate safety measures at the factory, including the lack of functioning exhaust systems and protective gear, further endangering workers' health as they face exposure to lead in their workplace.