Occupational Health Risks of Styrene Exposure

Styrene is an aromatic hydrocarbon extensively employed in the manufacture of plastics, resins and rubber-based materials, making occupational exposure a matter of global concern. Inhalation represents the primary route of uptake in industrial settings, with peak concentrations arising during polymerisation, moulding and surface finishing operations. Acute exposure commonly elicits mucous membrane irritation, headache and dizziness, whereas chronic low-level inhalation has been linked to neurocognitive impairments, respiratory dysfunction and genotoxic stress. Epidemiological investigations have explored associations between styrene inhalation and malignancies of the lymphatic and haematopoietic systems, although findings remain equivocal, reflecting differences in exposure assessment, latency and confounding variables. Mechanistic studies in rodent models elucidate a cytochrome P450-mediated mode of action culminating in cytotoxicity and proliferative responses in terminal bronchioles, but interspecies differences in metabolic capacity underscore uncertainties in human relevance. Advances in biomonitoring, including urinary metabolite enumeration and oxidative stress markers, offer refined tools for exposure assessment and risk characterisation. Occupational limit values and engineering controls, such as closed systems and local exhaust ventilation, remain central to mitigation strategies. Continued integration of epidemiological data, mechanistic insights and omics-based biomonitoring will drive evidence-based revisions to exposure standards and global health guidelines.

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Occupational Health Risks of Styrene Exposure publication trend

The graph below shows the total number of articles in occupational health risks of styrene exposure across all publications each year (not limited to Nature Index journals).

Technical terms

Biomarker: A measurable substance in biological specimens indicating exposure, effect or susceptibility to a chemical agent.

Metabolomic profiling: Comprehensive analysis of small-molecule metabolites in a biological sample to assess physiological or pathological states.

Oxidative stress: An imbalance between reactive oxygen species production and antioxidant defence that can damage cellular macromolecules.

Standardised incidence ratio (SIR): A ratio comparing observed disease cases in a study population to expected cases based on reference rates.

Mode of action (MOA): A sequence of key biochemical and cellular events leading to an adverse health outcome following chemical exposure.

References

1. Procedural application of mode-of-action and human relevance analysis: styrene-induced lung tumors in mice. Critical Reviews in Toxicology (2024).
2. NMR Untargeted and HPLC-MS/MS Targeted Metabolomic Approaches for Evaluating Styrene Exposure in the Urine of Shipyard Workers. Toxics (2024).
3. Cancer mortality in an international cohort of reinforced plastics workers exposed to styrene: a reanalysis. Occupational and Environmental Medicine (2018).
4. Mortality of a cohort of workers in the styrene-butadiene polymer manufacturing industry (1943-1982).. Environmental Health Perspectives (1990).
5. Editor’s Highlight: Complete Attenuation of Mouse Lung Cell Proliferation and Tumorigenicity in CYP2F2 Knockout and CYP2F1 Humanized Mice Exposed to Inhaled Styrene for up to 2 Years Supports a Lack of Human Relevance. Toxicological Sciences (2017).