How Wildfire Smoke Affects Your Body and What to Do After Exposure

The size distinction matters biologically. Larger particulates tend to lodge in lung tissue and cause local damage. Ultrafine particles are small enough to cross the alveoli directly into the bloodstream, where they can circulate to the brain, heart, liver, kidneys, and muscles.

Modern fires compound this problem. Many fires now burn through structures that contain plastic siding, flame-retardant furniture, household solvents, and metal building components. These types of wildfires burning through human-made structures function more like “hazmat fires” than simple brush fires.

For example, emergency responders working the 2025 Los Angeles fires were found to have elevated blood levels of lead and mercury, byproducts of combusted building materials and soil.

Mercury exposure has a particularly interesting pathway. Coal-burning emissions from China travel across the Pacific as tracked atmospheric plumes (sometimes called the Mongolian and Beijing plumes), depositing mercury into West Coast soils. Coniferous trees then sequester this mercury in their needles.

When those trees burn, the mercury re-enters the air as part of wildfire smoke, meaning a fire in California can be redistributing pollution that originated on another continent years earlier.

The Neurological and Cardiovascular Evidence

Research from Dr. Lilian Calderón-Garcidueñas, who has studied brain and blood vessel tissue from residents of Mexico City, considered one of the world’s most polluted cities, shows that ultrafine particulates, including lead and iron nanoparticles, cross into brain tissue and have been detected even in infants and young children, suggesting in utero exposure is possible.

This research has also linked airborne particulate exposure to elevated rates of Alzheimer’s and Parkinson’s disease, and a recent study has specifically correlated wildfire smoke exposure with rising dementia diagnoses.

A second major study published in 2024 in the New England Journal of Medicine examined microplastic particles found in plaque removed during carotid artery surgery. Patients whose arterial plaque contained detectable microplastics showed a distinct immune signature, elevated interleukins and CD-cell markers indicating active inflammation, resembling components of a cytokine storm.

Most interestingly, those patients were 4.5 times more likely to experience a stroke, heart attack, or die from any cause within the following three years, compared to patients without detectable microplastics.

Post-Exposure Remediation: Cleaning the Environment

A point we can’t emphasize enough is that ultrafine particles settle once visible smoke clears.

Particulates adhere to walls, ceilings, and floors, become embedded in household dust, and function as an ongoing, low-level exposure source of the same chemicals present during the original event.

This mirrors what happens with mold and mycotoxins, which both settle into porous surfaces and dust, creating a persistent low-grade exposure that continues long after the initial event. This is why surface-level cleaning alone often isn’t enough for either.

Air purifiers remain an important part of remediation, but not all of them are equipped to handle wildfire-level particulates. Many popular air filtration devices advertise “removing 99% of particles,” but that figure typically refers to particles around 3 microns, which is much larger than the ultrafine particles (under 0.1 microns) found in wildfire smoke.

An effective device needs to filter down to that 0.1 micron threshold, and filtration capacity depends heavily on how much filtration media the unit actually contains: many air purifiers hold only a half-pound to a pound, while higher-capacity units contain closer to 15 pounds, allowing them to keep filtering effectively rather than clogging and letting unfiltered air pass through.

We suggest investing in a quality air purifier such as IQ Air and Austin Air, which both filter down to 0.1 micron.

That said, air filtration alone isn’t sufficient.

Because ultrafine particles settle into walls, ceilings, floors, and standard household dust rather than staying airborne, patients are often surprised to learn that physically cleaning their space is a powerful tool.

This requires both wet and dry mopping and specific dusting techniques, rather than dry sweeping or standard vacuuming alone. This step is usually more effective than an air purifier because air filtration can’t remove particulates that have already embedded themselves in a carpet or on walls.

When possible, the two work best together. A good air filtration system to address what’s still airborne, and direct cleaning of the walls and floors to address what’s already settled into the home.

One tool we recommend is the OXO Microfiber Extendable Duster (favorite because the microfiber can be easily be removed and washed).

This two-part remediation practice is not just for anyone dealing with wildfire smoke, but for anyone dealing with mold and mycotoxins or other environmental toxicants, which is to say, almost everyone can benefit from having both remediation techniques in place.

Post-Exposure Remediation: Restoring the Lung Lining Fluid

The lungs and sinuses are coated in a thin protective layer called lung lining fluid, an evolutionary adaptation to airborne environmental hazards (humans evolved alongside volcanic and other natural sources of air pollution long before industrial or wildfire smoke existed). This fluid is rich in:

• Glutathione (the body’s primary antioxidant, and by volume one of its most abundant proteins)
• Cysteine
• Vitamin E
• Vitamin C

Wildfire smoke exposure depletes this reserve. Remediation strategy centers on replenishing it most directly through nebulized glutathione, a prescription intervention that delivers the antioxidant in aerosolized form directly to the sinuses and lungs.

There’s a clinical parallel worth noting here: a substantial share of COVID mortality resulted not simply from the virus itself but also from secondary bacterial pneumonia after immune suppression. This underscores why treating post-toxicant inflammation matters beyond the initial exposure event.

Post-Exposure Remediation: Oral and IV Antioxidant Support

Daily oral remediation, elevated after any smoke exposure, may include:

• Vitamin C
• N-acetylcysteine (NAC), a glutathione precursor
• Liposomal glutathione
• Vitamins A and E

How Wildfires Affect Water Quality

Fires can compromise drinking water in two specific ways. First, heat damages plastic (PVC) water delivery pipes. Published research documented elevated microplastic contamination in water systems following Northern California wildfires as a direct result of heat-damaged plastic piping.

Second, airborne contaminants from smoke precipitate out of the atmosphere with rainfall, settling into the open reservoirs, streams, and rivers that supply regional drinking water.

A separate but related concern is disinfection byproducts, carcinogenic compounds formed when chlorine or chloramine used to treat water reacts with organic matter. These become aerosolized in hot shower water and can be inhaled during bathing.

The EPA has acknowledged these as a cancer risk affecting more than just respiratory tissue, making shower water filtration (not just drinking water) part of a complete remediation strategy.

Total Body Burden

Post-exposure remediation is best understood through the environmental medicine concept of total body burden. This is the cumulative toxicant load (particulate metals, microplastics, flame retardant compounds, solvents) a person carries at any given time.

Treating a single exposure event in isolation, without addressing this cumulative burden, leaves the underlying inflammatory and immune dysfunction in place, which is why detoxification support is often paired with any acute infection treatment.

It’s easy to assume wildfire smoke is only a concern for people who’ve lived through a fire directly, but as this article makes clear, that’s just not the case.

Between ultrafine particles that travel across oceans, water systems affected by fires hundreds of miles away, and smoke residue that lingers in homes long after the air outside has cleared, wildfire exposure reaches far beyond the immediate zone of impact.

It affects nearly everyone, and to a greater degree than most people realize, and for patients already managing complex chronic illness, it’s one more piece of the total body burden puzzle worth staying ahead of.

The good news is that the same remediation strategies, including filtering both air and water, physically cleaning the spaces we live in, and supporting the body’s own detoxification pathways, are available to almost anyone, regardless of proximity to a fire or the size of their budget.

Taking these steps is about being prepared, informed, and proactive in a world where this kind of exposure has become part of everyday life.

The following resources were highlighted during Dr. Nafysa Parpia’s conversation with Dr. Lyn Patrick for the Gordon Medical Forum podcast episode The Underestimated Health Risks of Wildfire Smoke and Remediation Strategies. Listen to the full episode for an even deeper dive into these topics.