After Significant Smoke or Ash Exposure

What to watch, document and do for your health

2. What New York built to monitor residents and survivors

New York did not create one single monitoring system immediately after 9/11. Several different systems developed over time, often after residents, workers, clinicians, unions and advocacy groups pressed for recognition and care.

That history matters. It shows both what long-term monitoring can accomplish and what can be lost when a community response begins slowly.

Early environmental and household assessment

Government agencies sampled outdoor air, settled dust and selected residences in Lower Manhattan. Investigators looked for substances such as asbestos, crystalline silica, fiberglass and gypsum that might have come from pulverized construction materials. These measurements helped characterize parts of the environment, but they could not recreate every individual’s exposure during the initial dust cloud or the months of resuspended indoor and outdoor dust.

The limitation is crucial: by the time systematic sampling occurs, the most intense exposure may already be over. Average outdoor measurements may not represent conditions inside a heavily contaminated apartment, school or workplace. A community therefore needs both environmental measurements and records of where people were, what they encountered and how their health changed.

The World Trade Center Health Registry

Federal funding for the New York City Department of Health and Mental Hygiene to establish the World Trade Center Health Registry was authorized in 2002. Enrollment opened in 2003 and closed in 2004. More than 71,000 people completed an initial interview, making it the largest post-disaster health registry in United States history.

The Registry included:

• Rescue, recovery and cleanup workers
• Lower Manhattan residents
• People who worked in the area
• Students and school staff
• People who evacuated the towers
• Passersby and others present during the disaster
  
  

The Registry is primarily a surveillance and research system, not a medical clinic. It collected a baseline exposure and health history, conducted repeated survey “waves,” linked information with health and cancer records, studied emerging conditions and directed enrollees toward services.

This distinction is easy to miss. A registry helps researchers see patterns across a population. It does not, by itself, diagnose or treat every participant.

Among the early findings, 67% of enrollees reported new or worsening respiratory symptoms, nearly 3% reported newly diagnosed asthma after 9/11, 16% screened positive for probable post-traumatic stress disorder and 8% screened positive for serious psychological distress. These were self-reported findings within a volunteer registry and should not be read as rates for every exposed New Yorker.

Over time, Registry research contributed to the understanding of respiratory disease, gastroesophageal reflux, cancer, PTSD, depression, chronic pain, cognitive concerns, quality of life, aging and resilience. It also helped demonstrate that intense dust-cloud exposure and heavy dust contamination in homes were associated with greater respiratory and mental-health risks.

Clinical care for community members

In 2002, clinicians at Bellevue Hospital began documenting new cough, wheeze and shortness of breath among downtown residents. New York City funded the World Trade Center Environmental Health Center community program in 2006. Federal funding for screening, diagnosis and treatment of residents, students and other community members followed in 2008.

The James Zadroga 9/11 Health and Compensation Act, signed in 2011, established the federal World Trade Center Health Program. The program now serves eligible responders and survivors, including people who lived, worked, attended school or daycare, or were present in the dust cloud within the defined New York City disaster area.

The World Trade Center Environmental Health Center operates clinical sites within NYC Health + Hospitals and, by the 25th anniversary, was caring for nearly 22,000 survivors. It provides physical and mental-health evaluation, monitoring and treatment for eligible residents, workers, students, commuters and others.

Responders and survivors do not receive identical benefits. Enrolled responders receive annual medical monitoring. A survivor generally receives an initial evaluation and becomes eligible for annual monitoring after a WTC-related condition is certified. That difference shows why the words registry, screening, monitoring and treatment should not be used interchangeably.

What New York’s experience teaches other communities

The most useful elements were not a one-time “toxin test.” They were an infrastructure that could continue learning:

• A defined population of exposed people
• A baseline exposure and health history
• Repeated follow-up rather than a single survey
• Links to medical, hospitalization and cancer records
• Specialized clinical care
• Physical and mental-health services in the same system
• Continuing research as new questions emerged
• A legal and funding structure capable of lasting beyond the news cycle
  
  

New York’s response also exposes weaknesses. The main Registry did not enroll people until two years after the event. Enrollment then closed, leaving later-recognized exposed people outside that particular cohort. Community treatment developed gradually, and federal legislation took almost a decade. Residents and advocates had to push for recognition while living with uncertainty.

For Lahaina and future mass fires, the lesson is to begin earlier: identify the exposed population, record exposure circumstances, obtain useful baseline information, preserve environmental data and connect surveillance with care.

Why 9/11 was an unusual exposure

It is reasonable to suspect that 9/11 produced a more concentrated and unusual exposure than most community fires, but the comparison should be based on what burned and how people encountered it, not on tragedy alone.

The World Trade Center exposure combined an instantaneous high-rise collapse and dense alkaline dust cloud with jet fuel, building materials, oils, vehicle fuel, burning contents, a debris pile that burned for months and repeated resuspension during recovery. The mixture included cement, gypsum, glass fibers, silica, asbestos, metals and complex combustion products.

The height of the towers mattered mainly because of the extraordinary amount of building material and contents dispersed by their collapse. Jet fuel helped ignite the fires, but it was not the only or necessarily the longest-lasting source. Burning and pulverized building contents, oils, vehicle fuels and the prolonged debris-pile fire all contributed to the mixture.

Lahaina also involved more than vegetation. Homes, businesses, vehicles, boats, batteries, propane, gasoline, motor oil, paints, treated materials, wiring and household products were present across the burned community. Hawaiʻi’s ash testing confirms that the resulting debris contained metals above health-based screening levels in some locations. But the exact quantities burned and the dose received by each resident are not known.

We therefore should not declare that one event was categorically “more toxic” than the other. The exposure pattern was different:

• 9/11: a massive instantaneous collapse and dust cloud followed by concentrated, prolonged rescue and debris-pile exposure in a dense high-rise district.
• Lahaina: a rapidly moving community fire, evacuation through smoke and combustion products, widespread destruction of low-rise structures and vehicles, and later ash, debris, cleanup and rebuilding exposure.
  
  

Both events demonstrate why the phrase smoke exposure is too simple.



3. Why one fire is not the same as another

The word wildfire can hide important differences.

A vegetation fire may burn grasses, brush and trees. A community or wildland-urban-interface fire may also burn homes, businesses, vehicles, batteries, wiring, plastics, paints, treated wood, carpeting, appliances, pesticides, fuels and stored household or industrial chemicals.

All smoke is a complex mixture. Its composition changes with the material burning, temperature, oxygen supply, weather, distance and the way smoke ages in the atmosphere. Fine particulate matter, commonly called PM2.5, is a central concern because particles this small can travel deep into the lungs. Smoke can also contain gases, volatile organic compounds, polycyclic aromatic hydrocarbons and other substances.

When manufactured materials burn alongside vegetation, the chemical mixture may be different and potentially more complex. National Academies work on wildland-urban-interface fires notes the need to understand both the chemicals produced and the pathways by which people are exposed. Recent experimental research also suggests that the co-combustion of biomass, polymers and batteries can create respirable particles enriched with metals and other toxic compounds, although real-world exposure varies widely.

After the flames are out, ash and settled dust create a different exposure problem. What was airborne may settle on soil, floors, furnishings, vehicles, ventilation systems, clothing and other surfaces. Cleanup, wind, foot traffic and construction can disturb it again.

This means a useful health history should distinguish among:

• A few hours of regional vegetation smoke
• Repeated smoke exposure over days or weeks
• Direct exposure inside or beside a burning community
• Contact with ash or debris
• Cleanup, demolition or rebuilding work
• Returning to a contaminated home, vehicle or workplace
• Repeated exposure when ash and dust are disturbed
  
  

It is not possible to determine risk from the name of the fire alone.



4. Lahaina: what environmental testing found

The August 2023 Lahaina fire was a community fire. It burned residences, businesses, vehicles and infrastructure as well as vegetation.

The Hawaiʻi Department of Health tested ash collected from 100 Lahaina properties in November 2023. The state reported arsenic above a health-based screening level in many samples. Lead, antimony, cobalt and copper also exceeded screening levels in some samples.

These findings do not show that every resident absorbed a harmful dose. Environmental testing tells us what was present in sampled ash. It does not tell us how much entered any particular person’s body.

The Department of Health emphasized that accidentally swallowing ash was the greatest contaminant concern, with inhalation of disturbed ash and dust also a concern. Young children are especially vulnerable to ingestion because of hand-to-mouth activity. Skin and eye contact may cause irritation, and damaged skin may provide less protection than intact skin.

Later environmental monitoring and debris removal reduced many opportunities for continuing exposure. That is important and reassuring. But it does not erase the need to understand what occurred during the fire, the earliest return periods or cleanup.

What Maui health research has found so far

The Maui Wildfire Exposure Study, or MauiWES, was established as a community-based cohort to examine midterm and long-term health after the fires. A 2025 peer-reviewed analysis included more than 1,100 adults assessed six to fourteen months after the disaster.

Researchers found associations between higher exposure and poorer respiratory outcomes, including measurable differences in lung function among people living closer to the burn zone. Fatigue, respiratory symptoms, depression and anxiety were also important concerns. Social conditions, including displacement and access to care, are part of the health story rather than unrelated background.

These findings should be interpreted carefully:

• They identify patterns within the study population.
• They do not prove that smoke or ash caused every symptom or test result.
• Some participants had health conditions before the fire.
• The cohort is continuing, so the long-term picture is not yet complete.
  
  

The value of MauiWES is precisely that it does not wait decades to begin collecting information.

5. How smoke, ash and contaminants can enter the body

Inhalation

Breathing is usually the main route during active smoke exposure. Fine particles may reach deep into the lungs. Irritating gases and larger particles may affect the eyes, nose, throat and upper airways. How much a person inhales depends on concentration, duration, breathing rate, time indoors or outdoors, ventilation and respiratory protection.

Heavy physical work increases the amount of air breathed each minute. This is why outdoor work or exercise during smoky conditions can increase the inhaled dose.

Swallowing

Ash or dust can reach the mouth from contaminated hands, food, water, dishes, toys and surfaces. Young children may swallow more because they frequently touch the ground and place their hands or objects in their mouths.

The respiratory system also clears some trapped material toward the throat, where it may be swallowed. Ingestion therefore can occur even when a person did not knowingly eat contaminated material.

Skin contact

Intact skin is an important protective barrier, and it generally prevents more entry than the lungs or digestive tract. Nevertheless, ash can irritate skin, collect under clothing and contact cuts, burns, rashes or other damaged areas. Wet ash may be more irritating than dry ash because water can release substances from the particles.

Eye contact

Smoke and ash can irritate the eyes. Rubbing may worsen irritation or scratch the eye if particles are present. Persistent pain, light sensitivity or visual change deserves medical attention.

Continuing exposure after the fire

Exposure may continue when contaminants remain in indoor dust, furnishings, vehicles, soil or ventilation systems. Cleanup, demolition and rebuilding may place particles back into the air. EPA and CDC guidance therefore emphasizes appropriate respiratory protection, protective clothing and methods that avoid dry sweeping or otherwise stirring up ash.



6. One exposure, interconnected body systems

Smoke and ash do not create isolated “lung effects.” The lungs may be the principal entry point for smoke, but inhaled particles and the body’s response to them can affect circulation and inflammation throughout the body. Swallowed material enters through the digestive tract. Psychological trauma, displacement, disrupted sleep and loss can affect health alongside the chemical exposure.

Lungs and airways

The strongest and most consistent evidence concerns respiratory effects. Smoke may cause eye and throat irritation, coughing, phlegm, wheezing and difficulty breathing. It can worsen asthma and chronic obstructive pulmonary disease and has been associated with respiratory infections and increased use of urgent and emergency care.

Persistent symptoms, more frequent asthma attacks or a measurable decline in exercise tolerance deserve attention.

Heart and circulation

PM2.5 exposure can contribute to inflammation, changes in vascular function and stress on the cardiovascular system. Wildfire smoke has been associated with cardiovascular events, although findings vary by population, outcome and exposure window. People with heart disease, hypertension, diabetes or other vascular risks may be more vulnerable.

Chest pressure, fainting, severe breathlessness or new neurological symptoms require urgent assessment. Palpitations, an unexplained decline in stamina or unusual breathlessness should also be discussed with a healthcare professional.

Brain and nervous system

Headache, dizziness and difficulty concentrating can occur during acute smoke exposure, but they are nonspecific and may also be related to heat, dehydration, sleep deprivation, carbon monoxide, medication changes or emotional stress.

Research into longer-term neurological and cognitive effects of wildfire smoke is developing. It is reasonable to document new or persistent cognitive changes without assuming that the fire caused them.

Digestive tract

The digestive tract matters because contaminated ash or dust may be swallowed directly or cleared from the airways and swallowed. Nausea, vomiting or abdominal symptoms immediately after a major exposure may have several causes and should be evaluated in context.

Liver

The liver helps transform and process many substances that enter the circulation. That does not mean a mass-fire exposure will routinely cause abnormal liver enzymes or identifiable liver injury. Liver tests may be appropriate based on symptoms, known contaminants, medications and the person’s overall medical situation, but they are not a universal “fire exposure test.”

Kidneys and urinary system

The kidneys filter the blood and eliminate many water-soluble substances and their metabolites. Kidney function is also important when dehydration, heat, medication use or exposure to particular metals is a concern. People with chronic kidney disease may be more vulnerable during smoke and heat events and should be cautious about large changes in fluid intake or sauna use.

Skin and eyes

Ash can irritate the skin and eyes even when systemic absorption is limited. Prompt washing, clean clothing and avoiding further contact are practical measures. Eye pain, persistent redness, light sensitivity or vision changes require evaluation.

Immune and inflammatory responses

The body’s response to inhaled particulate matter includes inflammation and oxidative stress. These processes help explain why effects may extend beyond the airways. The exact response varies with the exposure and the individual.

Pregnancy and reproductive health

Pregnancy is a period of increased concern because smoke exposure has been associated in population studies with adverse pregnancy outcomes, while some combustion by-products are reproductive or developmental hazards. A pregnant person with significant exposure should contact their prenatal care professional rather than waiting for symptoms.

Mental and emotional health

The mental-health consequences of a mass fire may arise from danger, bereavement, displacement, financial loss, disrupted community, uncertainty and exposure itself. Anxiety, depression, post-traumatic stress, sleep disturbance, substance use and grief deserve the same seriousness as physical symptoms.

Someone can be physically safe and still remain psychologically affected. Family and friends may notice withdrawal, irritability, nightmares or loss of function before the person identifies these changes.

7. Who may face greater risk?

Risk is shaped by both exposure and susceptibility.

Two different questions determine risk. Who received the greater exposure? This may include people caught close to dense smoke or burning structures, those unable to evacuate promptly, responders, cleanup and rebuilding workers, people without effective respiratory protection and those exposed repeatedly. Who may be more susceptible? This includes children, older adults, pregnant people and people with heart, lung, metabolic or kidney disease, limited mobility, relevant medications or existing mental-health vulnerabilities.

CDC and EPA consistently identify children, older adults, pregnant people and those with heart or lung disease as groups requiring additional protection. CDC also includes diabetes and chronic kidney disease among conditions warranting special caution.

Belonging to a higher-risk group does not mean that illness is inevitable. It means the threshold for reducing exposure, monitoring symptoms and seeking advice should be lower.



8. Firefighters: when exposure is part of the occupation

Residents may experience one catastrophic event or repeated seasonal smoke. Firefighters face a different problem: exposure can accumulate over an entire career.

Structural firefighters enter environments containing burning plastics, furnishings, electronics, insulation, treated wood, batteries, fuels and materials that may be unknown at the time of response. Wildland firefighters face vegetation smoke, long shifts, heat, dust and repeated fire-season exposure. Many departments also respond to vehicle fires, hazardous-material events and overhaul operations after visible flames are gone.

Exposure can continue beyond the fireground through contaminated turnout gear and equipment, soot transferred into apparatus and stations, diesel exhaust, firefighting foams and contaminants carried into vehicles or homes.

NIOSH notes that firefighters may encounter hundreds of chemicals. Benzene, formaldehyde and polycyclic aromatic hydrocarbons can be produced by combustion, while asbestos and other hazards may be released from damaged building materials. These substances can remain on protective gear after the incident.



In 2022, the International Agency for Research on Cancer classified occupational exposure as a firefighter as carcinogenic to humans, Group 1. IARC concluded that occupational exposure causes mesothelioma and bladder cancer. It also found limited evidence for several other cancers. A Group 1 classification identifies a cancer hazard; it does not mean that every firefighter will develop cancer or that all exposures carry the same risk.

Why firefighters need career-long records

A single fire report rarely captures cumulative exposure. Useful long-term records would include:

• Years and roles in the fire service
• Structural, wildland, vehicle and hazardous-material incidents
• Major unusual fires or chemical events
• Time spent in active firefighting and overhaul
• Respiratory protection practices
• Known failures or gaps in protective equipment
• Significant soot or skin contamination
• Decontamination and gear-cleaning practices
• Station and apparatus diesel exposure
• Training fires and materials burned
• Relevant symptoms, medical evaluations and diagnoses
  
  

The United States established the voluntary National Firefighter Registry for Cancer to link firefighters’ occupational histories with cancer data. By February 2026, more than 40,000 firefighters had enrolled. The Registry includes structural, wildland, career, volunteer, active and retired firefighters because those differences may help researchers understand which activities and exposures carry greater risk.

Participation does not replace healthcare. Its value is population-level knowledge: linking the work firefighters actually performed with diagnoses recorded over time.

Sauna as an optional recovery practice

In informal conversations at The Wellness Center, several Hawaiʻi firefighters expressed interest in infrared sauna after fire exposure but believed that obtaining public funding for saunas at every station would be difficult. These conversations were anecdotal, not a formal survey or an official evaluation by a fire department.

Research has not established that sauna reduces firefighters’ total contaminant burden or prevents occupational illness. Firefighters who choose sauna should view it only as an optional recovery practice, not a replacement for respiratory protection, on-site decontamination, clean protective gear, showering or career-long medical monitoring. The broader evidence and safety considerations are discussed later in this Guide.

Practical exposure reduction within the fire service

Firefighters cannot eliminate the fundamental hazard of entering dangerous environments, but departments can reduce avoidable exposure by emphasizing:

• Consistent use of self-contained breathing apparatus through firefighting and overhaul
• Gross decontamination at the incident scene
• Timely cleaning, inspection and replacement of contaminated gear
• Separating dirty gear from apparatus cabs, station living areas and personal vehicles
• Showering and changing clothing promptly
• Cleaning tools, equipment and frequently touched surfaces
• Diesel-exhaust controls
• Medical surveillance appropriate to occupational history
• Mental-health support, sleep protection and recovery
• Participation in exposure and cancer registries
  
  

This is not solely the firefighter’s personal responsibility. Departments, unions, equipment manufacturers, researchers, governments and communities share responsibility for safer equipment, adequate staffing, training, decontamination facilities, healthcare and long-term monitoring.

Firefighters and the lesson of 9/11

The FDNY response illustrates both extraordinary exposure and the value of an established workforce that could be followed. More than 15,000 FDNY firefighters, EMS professionals and civilian personnel were exposed during rescue and recovery operations lasting more than ten months. FDNY’s continuing medical monitoring has produced 25 years of clinical and research data.

The broader lesson extends beyond 9/11. A firefighter may not be able to identify which fire, overhaul operation or contaminated set of gear contributed to a later illness. Career-long monitoring and exposure records are therefore especially important.

9. Estimating the significance of your exposure

No simple formula can reconstruct an individual dose after the fact. The following questions can help create a more useful picture.

What burned?

Was it mostly vegetation, or were homes, vehicles, batteries, industrial sites or stored chemicals involved? Were you near the source or downwind from it?

How intense and visible was the smoke or dust?

Could you see normally? Did smoke enter the building or vehicle? Were surfaces visibly coated with ash? Did your eyes or throat burn?

How long and how often were you exposed?

Minutes, hours, days and repeated episodes are not equivalent. Record approximate times even if you cannot be exact.

What were you doing?

Resting indoors, evacuating, fighting the fire, walking long distances, searching debris and performing heavy cleanup produce different breathing rates and contact patterns.

What protection did you have?

Note whether you were in a closed building with filtered air, wore a properly fitted N95 or P100 respirator, wore a loose mask or had no protection. A respirator can reduce particle exposure but does not filter every gas or vapor.

Did exposure continue?

Record later entry into the burn zone, ash cleanup, contaminated belongings, construction work and repeated smoke events.

What symptoms occurred and when?

Symptoms beginning during or immediately after exposure may help establish timing. Their absence does not prove that no exposure occurred, and their presence does not identify a specific contaminant.

10. Early and changing signs worth noticing

Many symptoms after a disaster are common and have more than one possible cause. The goal is not to attribute every headache or tired day to the fire. Look for changes that are new, persistent, recurrent or progressively worse.

Breathing and airway changes

• A cough that does not resolve or repeatedly returns
• Wheezing or chest tightness
• Shortness of breath during ordinary activities
• More frequent use of a rescue inhaler
• More frequent asthma or COPD exacerbations
• Recurrent sinus, throat or voice irritation
• Respiratory infections that are unusually frequent or slow to resolve
  
  

Stamina and cardiovascular changes

• A clear decline in walking or exercise tolerance
• Breathlessness disproportionate to the activity
• Palpitations or an unusually fast or irregular heartbeat
• New swelling, faintness or persistent dizziness
• Chest discomfort
  
  

Neurological and general changes

• Persistent or recurrent headaches
• New difficulty concentrating or remembering
• Unusual fatigue
• Dizziness, weakness or balance changes
  
  

Skin and eye changes

• Persistent rash, irritation or poorly healing areas
• Continuing eye redness or discomfort
• Light sensitivity or visual changes
  
  

Sleep and emotional changes

• Nightmares or intrusive memories
• Difficulty falling or staying asleep
• Persistent anxiety, sadness, anger or numbness
• Avoidance of reminders or withdrawal from others
• Increased alcohol or drug use
• Loss of interest or ability to manage normal responsibilities
• Thoughts of self-harm or suicide
  
  

CDC advises contacting a healthcare professional for trouble breathing, shortness of breath, a cough that will not stop or other symptoms that do not go away.

Use function as a personal signal

One of the most useful observations may be a change in what you can do. If you previously climbed a flight of stairs, walked a mile or completed a work task comfortably and now cannot, record the difference. Function is not a diagnosis, but a consistent decline gives a clinician useful information.

11. Create a personal exposure and health record

Years later, memory fades and records scatter. Write down what you know while you can. An imperfect contemporary record may be more useful than a confident reconstruction much later.

Record six categories: where and when the exposure occurred; what burned; how long and under what conditions you were exposed; protection and cleanup activities; immediate and later health changes; and medical visits or test results. Preserve photographs, maps, air-quality reports, official notices and the names of people who were present when they help establish the circumstances.

Ask that a significant exposure history be included in your medical record. Do not assume that it will be remembered or transferred automatically between healthcare systems.

This record is not an attempt to prove causation. It creates a more reliable foundation for medical care, research, public-health monitoring and any future eligibility process.



Downloadable tool: Personal Exposure and Health Record provides space to preserve the complete history and continue adding later changes.

12. Preparing for a healthcare visit

A productive appointment begins with a focused story rather than a demand for every available test.

Bring:

• A one-page exposure summary
• A timeline of symptoms and functional changes
• A list of existing medical conditions
• Current medications and supplements
• Previous lung, heart, kidney or other relevant test results if available
• Your most important questions
  
  

Useful questions include:

• Does my exposure history change how you interpret these symptoms?
• Should the exposure be documented in my chart?
• Would a baseline respiratory assessment or spirometry be useful for me?
• Do my symptoms or risk factors justify cardiovascular evaluation?
• Is blood lead testing appropriate given when and how I contacted ash?
• If arsenic exposure may be recent or continuing, would speciated urine testing be useful?
• Could any of my medications increase risk from heat, dehydration or sauna use?
• What changes should prompt me to return?
• Should I see a pulmonologist, cardiologist, medical toxicologist, occupational or environmental medicine specialist, or mental-health professional?
• Are there local registries or long-term studies I can join?
  
  

If your clinician is unfamiliar with environmental exposure assessment, the Agency for Toxic Substances and Disease Registry provides clinician resources on taking an exposure history and evaluating specific substances.

13. What tests can and cannot tell you

There is no single “wildfire exposure test.” Testing works best when a clinician is trying to answer a defined question based on the exposure, timing, symptoms and individual risk.

Clinical examination and oxygen saturation

A basic examination can assess breathing, heart rate, blood pressure, oxygen level and other signs. A normal oxygen reading is reassuring at that moment but does not exclude asthma, subtle lung-function changes or every future problem.

Spirometry and other lung-function testing

Spirometry measures how much air a person can move and how quickly. It may help evaluate persistent cough, wheezing, breathlessness or declining stamina and can establish a useful baseline in selected highly exposed people.

A normal result does not prove that no exposure occurred or that no future respiratory condition will develop. An abnormal result also does not by itself identify the fire as the cause. Comparison with pre-fire testing, when available, is especially valuable.

Blood lead testing

Blood lead testing can identify lead currently circulating in the blood and is especially important for children, pregnant people and those with continuing or relatively recent contact with contaminated ash. The usefulness of a test depends on timing because blood lead does not perfectly reconstruct a past dose.

Hawaiʻi screened hundreds of West Maui residents after the fire and reported no evidence of widespread lead exposure, although a small number of participants had confirmed detectable levels. That population finding is reassuring but does not determine every person’s exposure.

Urine arsenic testing

ATSDR identifies a 24-hour speciated urine arsenic test as the most useful laboratory test for recent arsenic exposure. Speciation distinguishes toxic inorganic arsenic and its metabolites from organic arsenic compounds commonly found in seafood.

This test mainly reflects recent exposure. Years after a single event, it generally cannot reconstruct how much arsenic entered the body at the time. A total urine arsenic result may be misleading if seafood was eaten shortly before testing.

Other metal testing

Testing for a specific metal may be appropriate when there is a credible exposure pathway, compatible symptoms and a useful biological specimen. Broad commercial “heavy-metal panels” can produce low-level detections of uncertain significance. Results should be interpreted by a clinician familiar with toxicology and normal background exposure.

Cardiovascular evaluation

Blood pressure, pulse and a clinical examination are reasonable starting points. An electrocardiogram, rhythm monitor, blood testing or imaging may be appropriate when symptoms or existing risk justify them. They are not automatic screening tests for every person who encountered smoke.

Imaging

Chest X-rays and CT scans expose the person to radiation and may reveal incidental abnormalities. They should generally be ordered to answer a clinical question, not simply because a fire occurred. Normal imaging does not exclude every airway or functional problem.

Mental-health screening

Brief validated questionnaires can help identify depression, anxiety and post-traumatic stress before a person reaches a crisis. Screening is not a label. It is a way to identify who may benefit from a fuller assessment and support.

Tests that usually should not be ordered automatically

Without a specific clinical reason, be cautious about:

• Tumor-marker blood tests used as general cancer screening
• Hair-mineral analysis presented as proof of a past fire exposure
• Large commercial toxin panels without a defined question
• Repeated arsenic testing long after a one-time exposure
• Whole-body scans offered as reassurance
• Chelation or other treatment without a confirmed indication and qualified medical supervision
  
  

The two-sided limitation of testing

Testing can create false reassurance: a normal result today may not rule out a past exposure or future illness.

Testing can also create unnecessary alarm: low-level findings may reflect food, soil, work, hobbies or ordinary environmental background rather than the fire.

The best test is not the largest panel. It is the test that can answer a meaningful question and change what happens next.



14. Practical ways to support recovery

Recovery begins with preventing additional exposure. No food, supplement, exercise program or sauna can compensate for continuing to breathe smoke or disturb contaminated ash without protection.

Reduce continuing exposure

• Follow local air-quality and public-health guidance.
• Spend time in cleaner indoor air when outdoor air is unhealthy.
• Use appropriately sized portable air cleaners or effective central filtration where practical.
• Avoid dry sweeping, leaf blowing or other activities that place ash into the air.
• Wear a properly fitted NIOSH-approved N95 or P100 respirator when exposure cannot be avoided. Facial hair can prevent an adequate seal.
• Wear gloves, long sleeves, long pants, shoes and socks during ash cleanup.
• Keep children and pregnant people away from ash and debris cleanup.
• Remove contaminated clothing and shoes before spreading ash through clean areas.
• Shower and wash exposed hair and skin.
• Follow local instructions for contaminated food, water, soil and debris.
  
  

EPA notes that N95 and P100 respirators can reduce particle exposure when they fit and are used correctly, but they do not remove all gases and vapors.

Hydration

Maintain normal hydration, especially in hot weather, during physical work or when sweating. Water supports circulation, temperature regulation and kidney function. It may help keep irritated airways comfortable and respiratory secretions less tenacious.

Drinking excessive water is not a faster way to remove contaminants and can be dangerous. People with heart failure, kidney disease, electrolyte disorders or fluid restrictions should follow individualized advice.

Nutrition

Choose a nutritionally adequate pattern that supplies protein, vegetables, fruits or other fiber-rich plant foods, and sufficient energy for recovery. Nutritional status supports tissue repair, immune function and the body’s normal processing and elimination pathways.

No single food has been shown to neutralize a complex fire exposure. Be cautious about extreme fasts, supplement megadoses or products claiming to “bind every toxin.” Some supplements can injure the liver or kidneys or interfere with medications.

Sleep and restoration

Sleep supports immune regulation, cardiovascular health, cognition and emotional recovery. After a disaster, sleep may be disrupted by displacement, grief, anxiety, noise, pain or respiratory symptoms. Persistent sleep problems deserve attention rather than being dismissed as an unavoidable part of recovery.

Movement and exercise

Once the air is clean and acute symptoms have settled, gradual physical activity can support cardiovascular fitness, metabolic health, sleep, mood and a return to normal function.

Use your previous abilities as a reference. Reduce intensity and seek advice if activity causes new wheezing, chest discomfort, palpitations, dizziness or unusual breathlessness. Exercising in smoky or dusty air is different from exercising after exposure; during poor air quality, heavier breathing can increase the inhaled dose.

Avoid additional respiratory burdens

Smoking, vaping and secondhand smoke add stress to recovering airways and the cardiovascular system. Occupational dusts, strong solvents and poorly ventilated combustion sources may also matter. Reducing the total burden is more practical than trying to identify one perfect recovery intervention.

15. Hydration, sweating and infrared sauna

Some people use exercise or sauna-induced sweating as part of a broader recovery routine. This subject deserves a more thoughtful answer than either “sauna detoxes everything” or “sweating does nothing.”

What is known

Sweat is a genuine route of excretion. Studies have detected arsenic, cadmium, lead, mercury and other elements in sweat. Research comparing blood, urine and sweat has also shown that the concentration of some elements differs substantially among these fluids.

Regular sauna use has been studied for cardiovascular, circulatory and other health effects, although protocols and populations vary. Systematic reviews describe potential benefits while emphasizing the need for better trials and clearer guidance about frequency, duration and appropriate clinical populations.

What remains uncertain

Detecting a substance in sweat does not by itself prove that sweating removes enough to meaningfully reduce the body’s total burden or prevent later disease. The amount excreted varies by substance, person, sweat rate, collection method and exposure history.

Research has not established a standard exercise or sauna protocol for people exposed to wildfire or structural-fire contaminants. It has not shown that sauna prevents cancer, lung disease or other delayed outcomes after a mass fire.

A reasonable practical position

For an adult who tolerates heat safely, purposeful sweating through clean-air exercise or sauna may be a reasonable personal addition to a larger recovery routine. Research has not established a frequency, duration or intensity specifically for people exposed to wildfire or structural-fire contaminants. Sweating should not be presented as a guaranteed antidote or substitute for medical care.

Infrared sauna may be more comfortable for people who dislike very hot air, but “infrared” should not be used as proof that a sauna removes a particular contaminant more effectively. The useful questions are whether the person can tolerate the heat, whether the practice improves well-being and whether it can be used without creating dehydration or cardiovascular stress.

Use heat safely

• Begin conservatively if you are not accustomed to heat.
• Enter well hydrated and replace fluids afterward.
• Avoid alcohol before and after sauna use.
• Do not use sauna while acutely ill, dizzy, dehydrated or still suffering significant smoke-related breathing symptoms.
• Stop for chest discomfort, faintness, unusual weakness, palpitations, severe headache or breathing difficulty.
• Discuss sauna use with a healthcare professional if you have heart disease, low or unstable blood pressure, kidney disease, fluid restrictions, difficulty regulating body temperature or medications that affect blood pressure, hydration or sweating.
• Do not treat sweating as evidence that a dangerous exposure has been corrected.
  
  

There is also a possible downside to very aggressive heat exposure: sweat contains useful electrolytes and trace elements as well as unwanted substances. More intense or longer sweating is not automatically better.

Evidence category: reasonable supportive practice, but not proven to reduce fire-related contaminant burden

Sweat can contain certain metals and other compounds. Sauna may provide circulatory, relaxation and general wellness benefits. We do not yet know whether a particular sweating routine meaningfully lowers the total burden of wildfire contaminants or changes long-term outcomes.

16. How family and friends can help

An exposed person may be managing grief, displacement, insurance, rebuilding and ordinary life at the same time. Health monitoring can easily fall to the bottom of the list.

Family and friends can:

• Help reconstruct dates, locations and conditions
• Preserve photographs, messages, maps and official notices
• Notice gradual changes in breathing, stamina, memory, mood or sleep
• Encourage evaluation without predicting the worst
• Attend appointments and take notes when invited
• Help organize test results and medical records
• Support clean indoor air, nutritious meals, hydration and recovery routines
• Help with childcare or transportation
• Take depression, trauma symptoms and suicidal thoughts seriously
• Respect that recovery does not follow a fixed timetable
  
  

Use observation rather than accusation. “I have noticed that you stop twice on the walk you used to complete easily” is more useful than “The fire damaged your lungs.” The first identifies a change. The second claims a cause that has not been established.