Elevated Lead Levels Detected in Workers at South Korean Battery Plant, Raising Health Concerns
Ulsan, South Korea – A growing number of workers at a DN Automotive battery plant in Ulsan have been found to have elevated lead levels in their blood, prompting concerns about potential long-term health effects and accusations of cover-ups. Recent analyses of health records reveal that 53 out of 350 workers who underwent routine health screenings between 2023 and 2025 showed blood lead levels exceeding established guidelines. The findings have ignited a dispute between the company and labor unions, who allege a systemic failure to protect worker health and a deliberate attempt to downplay the severity of the issue.
The controversy centers around the interpretation of acceptable lead levels and the potential health consequences even at relatively low concentrations. While DN Automotive maintains that no worker exceeded the domestic legal limit of 40 micrograms per deciliter (µg/dL), the labor union argues that this standard is far too lenient when compared to international benchmarks. The U.S. National Institute for Occupational Safety and Health (NIOSH) sets a much stricter limit of 10 µg/dL, a level experts say can still lead to chronic health problems. According to reports, several workers had levels close to or exceeding 30 µg/dL in 2023, triggering post-management protocols.
The Health Risks of Lead Exposure
Lead is a known neurotoxin, and even low levels of exposure can have significant health consequences. The Korea Disease Control and Prevention Agency highlights that even concentrations below 10 µg/dL can contribute to chronic kidney damage, hypertension, cardiovascular disease, and cognitive impairment. These findings align with broader international research on the detrimental effects of lead exposure. Workers have reportedly complained of symptoms including sleep disturbances, a detail noted in initial reports.
The union’s analysis of special health examination records revealed that 99 out of 115 workers who consented to the review had blood lead levels at or above the 10 µg/dL threshold considered dangerous by the NIOSH. This figure underscores the potential scale of the problem within the DN Automotive facility. The company, which manufactures components for electric vehicle batteries, utilizes materials such as lead, sulfuric acid, and antimony in its production processes, exposing workers to potential hazards.
Allegations of Pre-Exam ‘Chelation’ Therapy
Adding to the controversy, the union has accused DN Automotive of administering “chelation” therapy – a medical procedure used to remove heavy metals from the body – to workers *before* their routine health screenings. This practice, if confirmed, would raise serious ethical and legal questions, as it could artificially lower lead levels in blood tests, masking the true extent of exposure and hindering accurate diagnosis and treatment. The union alleges this was done to “neutralize” the system and conceal the problem.
The practice of pre-screening chelation therapy, if substantiated, would represent a deliberate attempt to manipulate health data and evade regulatory scrutiny. Chelation therapy itself carries risks and should only be administered under strict medical supervision for legitimate medical reasons, not to circumvent health and safety regulations. The union is calling for a thorough investigation into these allegations.
Regulatory Standards and International Comparisons
The current South Korean occupational exposure limit for lead is 40 µg/dL, a figure the union argues is outdated and insufficiently protective. This standard means that workers must reach a significantly higher level of lead exposure before being classified as having an “occupational disease” and triggering mandatory employer actions, such as facility improvements or administrative penalties. As reported by the Ulsan Daily, the union is advocating for stricter adherence to international standards, particularly the NIOSH guideline of 10 µg/dL.
The discrepancy between national and international standards highlights a broader debate about the appropriate level of protection for workers exposed to hazardous substances. Advocates for stricter regulations argue that prioritizing worker health should outweigh economic considerations, and that preventative measures are far more cost-effective than treating the long-term health consequences of lead exposure.
DN Automotive’s Response
DN Automotive has denied the union’s allegations of a cover-up and maintains that no worker has exceeded the legally mandated lead exposure limit. The company has not yet publicly addressed the specific claims regarding pre-screening chelation therapy. Further investigation is needed to determine the validity of these accusations and to assess the company’s compliance with health and safety regulations.
The company is legally obligated to provide annual special health examinations for workers in facilities handling hazardous materials like lead, sulfuric acid, and antimony. However, the effectiveness of these examinations is now under scrutiny, given the union’s findings and allegations of manipulation.
What Happens Next?
The labor union has filed a formal complaint with relevant authorities, demanding a comprehensive investigation into the allegations of elevated lead levels, pre-screening chelation therapy, and potential regulatory violations. The Ministry of Employment and Labor is expected to launch an inquiry into the matter, and the findings could lead to penalties for DN Automotive if wrongdoing is established. The investigation is expected to begin in early March 2026.
This case underscores the importance of robust worker health and safety regulations, transparent monitoring of workplace hazards, and independent oversight to ensure that companies prioritize the well-being of their employees. The outcome of this investigation will likely have broader implications for the battery manufacturing industry in South Korea and beyond, as demand for electric vehicle batteries continues to grow.
Key Takeaways:
- Elevated lead levels have been detected in workers at a DN Automotive battery plant in Ulsan, South Korea.
- The labor union alleges a cover-up and accuses the company of administering chelation therapy before health screenings.
- Current South Korean lead exposure limits are higher than international standards, raising concerns about worker safety.
- An investigation by the Ministry of Employment and Labor is expected to begin in early March 2026.
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