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Heavy Metal Air Pollution: Human Health Effects and Nanomaterial Strategies for Monitoring and Remediation

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This narrative review synthesizes evidence on the health impacts of airborne heavy metals (arsenic, cadmium, cobalt, copper, lead, mercury, aluminum) and explores emerging nanotechnology-based monitoring and remediation strategies. The review focused on peer-reviewed studies published between 2010 and 2025 from PubMed, Scopus, Web of Science, and Google Scholar. It addresses established disease associations, specific mechanistic pathways, and regulatory exposure limits for each metal.

Key numbers

For arsenic:

  • Arsenic is a recognized IARC Group 1 human carcinogen.
  • Major atmospheric arsenic sources: mining, smelting, pesticide and herbicide use, wood preservation, glass production, semiconductor manufacturing.
  • Ambient arsenic concentrations in PM2.5 have been reported at 2.87 plus or minus 2.08 ng/m3 (significant long-term carcinogenic threat).
  • OSHA permissible exposure limit (PEL): 0.01 mg/m3 for arsenic dust.
  • NIOSH recommended exposure limit (REL): 0.002 mg/m3.
  • All workers in copper slag processing approached or exceeded the OSHA PEL of 0.01 mg/m3 for arsenic (range: 0.009-0.018 mg/m3).
  • Health impacts: skin lesions, neurological impairment, cardiovascular disease, cancers of the lung, bladder, and kidney. Mechanistically, arsenic induces oxidative stress, disrupts endocrine and signaling pathways, and interferes with DNA repair.
  • Arsenic methylated metabolites (MMA and DMA) may be more toxic than inorganic forms, linking toxicity closely to its metabolic processing.
  • Table 1 compares major sources, exposure routes, environmental concentrations, and regulatory exposure limits for each metal reviewed.

Methods (brief)

Narrative review; PubMed, Scopus, Web of Science, Google Scholar; studies 2010-2025; focus on occupational and environmental inhalation exposure. Non-English studies, articles without full text, and publications unrelated to heavy metal exposure or human health were excluded.

Evidence fitness

Supports: arsenic inhalation toxicology, ambient air concentrations, and occupational exposure limits in the context of air pollution. Provides regulatory exposure limit reference values (OSHA PEL, NIOSH REL) relevant to occupational inhalation settings. Not a source for dietary arsenic exposure or food concentration data.

Limitations

Narrative (not systematic) review; emphasis on occupational inhalation settings; ambient concentrations cited may vary substantially by location and industry; some quantitative data from earlier reviews rather than primary measurement studies.

Update history

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