Study Finds Toxic Metals in Maui Fire Survivors

Healthcare worker performs finger-prick test on masked patient — Photo: Mircea Moira / Shutterstock

A new Maui study found residents near the burn zone still carry sharply elevated toxic metals tied to impaired lung function more than a year after the 2023 fires.

Story Highlights

Urine tests from 1,400 adults showed antimony, manganese, barium, and arsenic well above U.S. norms.
Higher metal levels were linked to abnormal breathing tests and reduced lung capacity.
Elevated metals persisted up to about 18 months after the fires, suggesting ongoing exposure.
Early Maui data and environmental samples also flagged heavy metals in the burn zone.

What The Maui Study Found About Metals In People

University of Hawaiʻi researchers reported that 1,400 adults living near the Maui burn area had much higher levels of several toxic metals than typical U.S. biomonitoring baselines. Media summaries of the peer-reviewed paper said antimony ran nearly 40 times higher, manganese 3.8 times higher, barium 2.3 times higher, and arsenic 2.2 times higher. These findings point to a clear exposure signal in the local population well after the flames were out, not just during the smoke event.

The team also linked these metal burdens to worse performance on standard lung function tests. People with more metals in their bodies were more likely to show abnormal spirometry, including lower breathing capacity and trouble moving air in and out of the lungs. That pattern matches concerns seen after other urban-interface fires, where ash, debris, and dust can linger and continue to harm respiratory health long after the smoke clears.

Why These Results Matter For Public Health

The reported exposure persisted for up to about 18 months after the 2023 fires, which raises practical questions for cleanup, housing, and worker safety. Long recovery periods can mean repeated contact with contaminated dust or ash. Earlier Maui Wildfire Exposure Study materials also flagged heavy metals in environmental samples and tied copper and arsenic to lower lung function measures like forced vital capacity and forced expiratory volume, reinforcing the new human biomonitoring results.

Initial fieldwork by the same project captured exposure differences in a smaller convenience sample soon after the disaster. Those early data, gathered in early 2024, suggested that impacted residents faced measurable chemical risks. The larger cohort now adds weight by showing broad elevation in key metals and a statistical link to impaired breathing. The study did not prove exact cause, but it mapped a meaningful association that health agencies can act on while longer research continues.

How This Fits A Wider Postfire Pattern

After big fires hit towns, the danger does not end when smoke lifts. Burned buildings, cars, wires, and plastics leave complex ash that can carry metals and other toxics into homes, yards, and work sites. Reviews of past disasters show similar exposure signals and note the challenge of pinning the source for every metal in every person. The Maui findings are consistent with that pattern and argue for longer-term testing and careful cleanup steps to cut ongoing exposure.

For families trying to rebuild, this is about trust and transparency. People want straight answers on what is in their air and dust, and what steps will lower risk. For officials, the lesson is clear: measure early, measure often, and share the results. That means regular biomonitoring, clear safety rules for cleanup, and targeted support for those with abnormal lung tests. One line from the research is simple and urgent: recovery must include long-haul health protection.