Fireworks, Wildfire Smoke, and Forever Chemicals: Bryan Johnson's Team on Measuring and Reducing Toxins

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Overview

In this episode of the Bryan Johnson Podcast, Johnson is joined by Blueprint co-founder Kate Tolo and his lead physician, Dr. Mike Mallin. Their subject is toxins: the ones people choose to expose themselves to, like Fourth of July fireworks, and the ones they can't avoid, like wildfire smoke and PFAS "forever chemicals." They take the categories one at a time, covering where each toxin comes from, what it does in the body, and what can be done to reduce exposure and clear what has already built up. Johnson's own test results supply most of the data. His position is that deliberately exposing yourself to chemicals is never a good idea, whatever the cultural reason. Mallin repeatedly pushes back in favor of a more practical view of priorities. All three insist they are not trying to scare anyone, though Mallin admits, half-joking, "maybe a little."

26 min read

A Brief Aside on AirPods and EMF

The episode opens with Tolo noticing that Johnson is wearing AirPods. He explains that he tried to avoid them, but the producer needed him to have an earpiece for audio feedback. He expects viewers to warn him about EMF exposure, so he suggests a future deep dive on the question. Tolo agrees it is a hot topic and says the evidence may not be strong enough to settle it either way, but they could at least share what exists. They do not return to it in this episode.

Why the Fourth of July Started the Conversation

The episode was prompted by the Fourth of July. Tolo says she and Johnson spent the following Saturday together and were stuck indoors all day because the air quality was, in her word, atrocious. Johnson had posted online that the fireworks would "bathe" the whole Los Angeles area in toxins, including heavy metals and "a whole bunch of other toxins that we've imported from China." He also said those toxins would settle into soil and water over the next 24 hours. He called it a strange tradition that "we celebrate life by bathing ourselves in death." The post drew a lot of backlash. Tolo summarizes the reaction as: let us have one day without being chastised. A friend of hers said the same thing the next day: "you can't take this away from us."

Tolo thinks people are poorly informed about how severe the air-quality hit is. She cites a cigarette-equivalence figure, and Johnson gives the details. During the show, he says, exposure was roughly equivalent to smoking one cigarette, with PM2.5 around 160. Twelve hours later, in the areas shown in purple on the air-quality map they put on screen, the exposure was equivalent to smoking 20 cigarettes.

Johnson then qualifies his own argument. The Fourth of July spike is not what will kill you. He works through a comparison: an extra 15 points of PM2.5, around the clock, 365 days a year, adds up to roughly 131,000 in exposure per year. By that measure the July Fourth spike is less than 1% of it, which he calls "not hugely consequential." His real point, he says, is that people routinely do harmful things and describe them as "living life" or happiness. When a harm can be identified, it is prudent to name it and, where possible, change the culture around it. He acknowledges that big explosions in the sky are exciting and appeal to "our primitive brain." But he questions whether taking children to fireworks shows and exposing them to toxins, which then reach them again through water and food, really counts as living life.

Mallin's Contrarian View: Chronic Exposure Matters More

Mallin offers what he calls a slightly contrarian view. If he were choosing interventions to improve air quality, banning fireworks would not be first on his list. He agrees with Johnson's underlying point that it is odd to celebrate life with things that harm us. But in terms of total health impact, he says, many things rank above fireworks. Using Johnson's own math, he argues that a moderate, continuous increase in PM2.5 from living in a city like LA every day has a huge impact. A large but short spike has a relatively small one. He describes his view as practical, focused on where effort will do the most for health, and Johnson's as more idealistic.

Johnson answers with a thought experiment. Imagine an alien observer who can't see human storytelling or cultural meaning and sees people only as biochemical beings. What would it make of creatures bathing themselves in chemicals as a ritual? Mallin extends the point to birthdays, which people celebrate with alcohol, pizza, and cake. Johnson agrees and calls himself "Buzzkill Bryan in this vector," a label he says he fully owns. A birthday, in his description, stacks up a "metabolic disaster": alcohol, sugar, and late nights. He predicts that in the future this association of celebration with "death practices" will be seen as insane. The cost, he adds, isn't paid only at the end of life but also in reduced cognitive performance and health along the way. He grants that Mallin's reasonable, practical framing has its place. What he wants to offer is a "contrast of clarity": it is never good to bathe yourself in chemicals, and people can celebrate and feel good without doing so.

Choice, Consent, and Shared Air

Mallin reframes Johnson's argument: most toxin exposure is not chosen. It comes from wildfires, chemicals in the water supply, and other sources individuals can't realistically control. That makes it all the more reasonable to choose well when a choice actually exists. Tolo wants to give people the benefit of the doubt, since she doesn't think most realize what they are choosing. She reads out effects of chronic PM2.5 exposure. It increases inflammation in the lungs, contributing to asthma and lung cancer. It enters the blood and causes inflammation and oxidative stress in the heart and blood vessels, leading to cardiovascular disease. It crosses the blood-brain barrier and causes neuroinflammation, which can lead to neurodegenerative disease. She also recalls from their trip to India that daily poor air quality significantly shortens lifespans there.

Tolo stresses one more point: fireworks are a non-consensual pollution of a shared resource. Having a few drinks with friends is a personal choice, but polluting the air affects everyone, including children. As with alcohol, she thinks the cultural narrative can shift, and she proposes drone shows instead of fireworks, with speakers added for the noise. Johnson backs up the shared-resource point with their Saturday: they wanted to do something outdoors, but LA looked fogged in with smoke. He repeats the India statistic Tolo had raised, that India would do more for its citizens' health by fixing air quality than by curing cancer, so air quality is a higher-yield endeavor than solving all of cancer. After India and the LA fires, he says, toxins have been top of mind. The team has been measuring and removing them, so watching cities across the country get covered in smoke "hurts my soul."

The LA Wildfires: A Before-and-After Test by Accident

Tolo contrasts fireworks, a societal choice, with the LA wildfires, which were forced on everyone. Mallin says they expected the results to be bad. Wildfire smoke is harmful in general, and because so many homes burned, residents were exposed to chemicals beyond what burning trees and other organic matter produce. Still, he says, they did not expect results as bad as Johnson's.

Johnson explains that by coincidence he had measured his baseline toxin levels a month or two earlier for a different therapy. That may have made him one of the only people in Los Angeles with a before-and-after comparison. He took the follow-up test around day five or six, while ash was still falling. The panel lists industrial-grade toxins of the kind released by burning homes and cars, and he says every one it measured was loaded into his body, landing between the 75th and 95th percentiles. On screen, he says, "you just see red down the line."

Mallin says the elevated toxins made sense given what was burning. Johnson was exposed to phthalates, plasticizers added to make plastics soft and flexible, such as MEHP and MBP, which are released in large amounts when homes burn. There was also a large rise in VOCs from burning materials and from household solvents in cleaners, foams, and sprays. Mallin lists the harms associated with both groups: reproductive and developmental problems, higher risk of asthma and allergies, carcinogenicity, inflammation, DNA effects, and oxidative stress. Levels went from roughly zero in Johnson's normal life to the 95th percentile, meaning higher than 95 out of 100 people.

Johnson says the results showed up despite real precautions. He stayed indoors most of the time, ran multiple air filters, and had a MERV 13 filter on his HVAC system. Those measures appear to have made only a minimal difference, he says. Someone outdoors without filtration could have fared worse. He separates two layers of the problem. First, society shouldn't generate toxins that expose everyone. Second, events like wildfires are outside anyone's control and form a separate route of exposure.

"Not Trying to Scare People," With a Caveat

Mallin picks up on the "not trying to scare anyone" line. Fear, he says, is a side effect of knowledge in a situation where most people don't understand air pollution. Where he lives, he has friends who sleep with their windows open while a wildfire is nearby because they don't want to run the AC and want the house to cool overnight. Knowledgeable, educated people, he says, don't realize how much air quality affects their health, and if a little fear helps educate them, he considers that acceptable.

Tolo lays out the team's framing in three parts. Some exposures are within collective control, like fireworks. Others, like wildfires, are not, and people shouldn't be afraid of them because such events have happened throughout history; the difference now is that we can measure them and learn from them. Third, since preventing wildfires or changing construction materials is likely very hard, the useful work is to test protocols for removing toxins after exposure, which she says is inevitable in today's society, and to find out how quickly, how difficult, and how accessible that can be.

Chemical by Chemical: What Burning Homes Left Behind

Johnson reads out specific details. One marker, HEMA, went from undetectable to a fivefold increase, reaching the 95th percentile at 23 micrograms per gram. He describes it as a derivative of vinyl chloride, released mostly in fumes from burning synthetic floors, pipes, and PVC wiring. He says both vinyl chloride and ethylene oxide are known carcinogens and long-term neurotoxins, with acute effects including headache and dizziness. His broader point is that you can go through a home's materials one by one, pipes, plastics, and so on, and find each of them in his post-fire test. Another marker, likely coming from furniture and electronics, he describes as a byproduct of the fire retardant TPP.

Tolo asks what it was like to get the results after how carefully he looks after his body. Johnson says it was a terrifying time. The fires were raging, he didn't know whether the house would burn, and his son was with him. They talked about leaving town and weren't sure what to do. Looking back, he thinks leaving would have been the right call because of the toxins, but at the time he was thinking about losing the house and everything in it. When the fires were out and he saw the results, it was "devastating," because the team scrutinizes every calorie he eats against scientific evidence. The positive next chapter, he says, is that the team then asked what they could do about it.

PFAS: Why "Forever Chemicals" Are So Hard to Clear

The discussion then turns to PFAS. Johnson describes them as a class of more than 12,000 man-made chemicals used for stain and heat resistance. People accumulate them mainly through water, non-stick pans, and fast-food wrappers, and the body can't eliminate them.

Mallin explains why they are called forever chemicals. Human bodies did not evolve alongside them. The kidneys reabsorb them rather than excreting them in urine, and the liver can't break them down. Their chemical bonds are among the strongest in nature, and there is no metabolic pathway to break them. The only known exits are non-urinary: sweating, breast milk, menstruation, childbirth, and to some extent stool. He singles out two promising routes: sweating through sauna, and stool, where fiber compounds can help bind the chemicals so the body can excrete them. Because clearance is so slow, their half-life in the body is measured in years; he gives a rough range of two to eight years before most of a given dose is gone. They are in every water supply, he says, and "that's not an overstatement," found even at the bottom of the ocean. So the challenge is preventing exposure and maximizing clearance, which he calls difficult.

Tolo adds half-life figures in the ocean: 41 years for PFOS and 92 years for PFOA. "They're better at longevity than Bryan," she jokes. Mallin adds that these chemicals disrupt the algae that manage carbon dioxide in the ocean, then admits he hesitated to mention it for fear of scaring Tolo further. Johnson cites clinical half-lives in humans: PFOS 3.4 to 5.7 years, PFOA 1.5 to 5 years, PFHxS 2.5 to 8.5 years. Because even tiny amounts are so disruptive, he says, extra caution is warranted. Mallin says he recalls, while asking not to be quoted, that he doesn't think any blood sample has been found without PFAS, meaning no one escapes it.

Johnson lists the effects that made him anxious about his own results: lower sperm count, disrupted thyroid hormones, immune suppression, elevated cholesterol, liver damage, increased cancer risk, neurodevelopmental problems, and lower fertility in women. Tolo adds a figure that stayed with her: higher PFAS levels are linked to a 40% lower chance of a woman becoming pregnant, which matters more as people have children later. Mallin says these chemicals directly reduce steroid and thyroid hormone production. Beyond causing oxidative stress and raising cholesterol by mimicking other fatty acids, he says, they change how DNA is expressed. When Tolo asks what steroid hormones are, he gives testosterone and estrogen as examples. PFAS reduce not only hormone production but also how well the system responds when levels should rise or fall, which he says matters especially for women with monthly cyclical changes.

An Untaken Test and a Father's Fireworks Confession

There's a lighter interlude. Johnson explains that Tolo ordered a PFAS test first, the tests sold out, and she gave hers to him "for science." It turns out she hasn't taken the replacement. It is sitting on her desk among a stack of finger-prick tests. Johnson calls this "catastrophic" and offers to be her testing partner. They agree to do it together that day, and Tolo adds that she is behind on her pace-of-aging test too. Johnson proposes a "blood party."

Tolo says she doesn't understand the appeal of fireworks, which leads Mallin to a confession: he took his kids to a Fourth of July show. They stayed up until 10 p.m., well past the family's usual bedtime, because he felt guilty, like a bad father, for not going. They watched from about a mile and a half away, never smelled smoke, and he isn't sure they had any exposure at all. The kids loved it. His broader point is that you can find a paper to villainize almost anything. At some point people have to weigh social connection, awe, and wonder against what is reasonable to cut for health. That balance is different for everyone and doesn't have to be perfect. He values the education the others are offering because it turns an uninformed decision into a conscious one.

Tolo says the goal is to have the conversation, and society might well decide fireworks are worth it. Johnson takes a firmer line. Many voices already talk about moderation or say that connection and purpose justify these things; to him that is "all storytelling." You can thrive, feel connected, have fun, and be a great family without covering each other in chemicals. He says he isn't shaming Mallin. He understands the arguments about social inclusion and not changing society overnight, but he thinks they lead people to a conciliatory conclusion that nothing needs to change. Few voices say plainly that this is a bad idea, and he wants to be one of them. Mallin calls it a worthwhile contribution.

Johnson's PFAS Results: Surprisingly Low

Johnson took a full PFAS panel including PFOA, PFOS, and PFHxS. His PFOA levels were in the lowest 25% for US men aged 20 to 49; he notes the comparison is age-specific because PFAS accumulate over time. His PFOS and PFHxS were in the lowest 25% compared with boys aged 12 to 19. He was surprised. He started Blueprint only five years ago, and before that he was only vaguely aware that non-stick pans might be bad, didn't have good water filtration, and lived what he calls a typical American lifestyle. If anything, he says, his habits before Blueprint were much worse than average. He wonders whether the past five years of Blueprint lowered his levels in ways they don't yet understand.

Mallin suggests several likely reasons. Johnson has used reverse osmosis water filtration for five years, and water is probably the largest PFAS source for most people. His diet is rich in antioxidants and fiber, which should help clear toxins and move them out through stool. He also doesn't eat meat, which Mallin calls another major PFAS source.

Tolo asks whether the problem is non-stick pans themselves or how they are made. Mallin says both. Manufacturing is the main source, particularly PFOA, the most feared compound, which was long used to make Teflon. But Teflon and other non-stick pans also release volatile compounds when heated to certain temperatures. Those compounds are less harmful than PFOA but still not good. Teflon itself is relatively inert unless heated to high levels or scratched, so he thinks the pans are less dangerous than most people believe. Tolo concludes it's still best to avoid buying them, both to avoid supporting the industry and to avoid exposure as they degrade.

Mallin also mentions an online calculator. You enter your municipal water system, how long you've lived there, and your age, and it estimates your serum PFAS levels from published testing data. For him, the estimate was nearly exact. At this point Tolo says the conversation is stressing her out, that she suspects listeners feel the same, and she asks to move on to solutions. She has messaged Johnson privately to say she doesn't have a water filter. He replies that it's easy to fix and she can get the same system he has.

Reducing Exposure: Water, Air, and Fast-Food Wrappers

Mallin starts with the good news. In his view, Johnson shows that both exposure and existing toxin load can be reduced. Johnson lists three encouraging results. His most recent microplastics test found a single particle, in the lowest 1% of the 4,000 samples they have collected and a 93% reduction from his previous levels. His repeat post-fire toxin test after about 20 sauna sessions showed those toxins "annihilated," though he allows that some natural tapering probably contributed. And his PFAS results were low. Sauna won't remove PFAS, he says, but his diet supports toxin removal. He presents these as the compounding effects of the whole Blueprint protocol, which he calls "best in world" for overall health.

On specifics, his under-sink reverse osmosis system with remineralization cost $1,300. Mallin bought his on Amazon for about $300, and Johnson says prices are competitive. For air, Johnson uses several commercial-grade IQAir HealthPro Plus units throughout his house, which he says cost about $1,000 each, because they aim to keep indoor air perfect at all times. He says cheaper competitive options exist and are fine. More effective still, he says, is a high-MERV filter in the HVAC system. MERV 13 is ideal, but the system has to be rated for it, since some can only take MERV 8 or 9. Higher numbers filter more.

Mallin shares a story from central Oregon, where wildfire smoke often blows over his area. During one of the worst fire seasons, outdoor PM2.5 stayed between 200 and 300 for about three months. Johnson points out that is five to ten times LA levels. Air purifiers sold out at Amazon and Home Depot, and his MERV 13 HVAC filter couldn't keep up. So he borrowed box fans from friends, duct-taped HVAC filters to the backs of them, and ran two in the house. He also taped the doors and covered the bathroom vent fans with plastic wrap because smoke was drifting in through them. About five years later, he notes, you can buy the same thing ready-made on Amazon for around $70. He still considers a good HVAC filter the best tool for indoor air quality.

Asked whether his family suffered lasting effects, Mallin says he didn't measure anything at the time but is sure everyone in the area had significant exposure. That smoke was mostly from burning wood rather than homes, so the chemicals would differ, but the PM2.5 was still harmful. That is why he thinks it's important to reduce risk at least inside the home.

Tolo recommends free air-quality apps for day-to-day decisions. After the fireworks, for example, a reading around 150 PM2.5 meant no outdoor exercise. She also recommends indoor monitors to check whether home measures are working compared with outdoor air. Mallin adds that EPA standards differ somewhat from what research suggests: the research indicates health effects above about 50, yet in his hometown kids' sports still go ahead up to 200 because the EPA hasn't said otherwise. Tolo notes the reading at the time of recording was 35.

Johnson adds fast-food wrappers. He cites a study finding that over half of the grease-resistant molded-fiber paper tested from major chains contained PFAS. He says these are being phased out in California but remain potential sources of contamination, "a good excuse to not eat fast food." Tolo refers back to their microplastics episode for daily steps and sums up the main priorities: water, air, avoiding non-stick pans and fast-food packaging. You don't need to go overboard, she says, to make significant gains.

Clearance: Sauna, Diet, HBOT, and Fiber

Johnson's current sauna protocol is a dry sauna at 200°F (93°C) for 20 minutes. He says they chose dry sauna because the evidence is more compelling, and they were shocked by how well it worked. Mallin says he had never seen such a dramatic drop from any toxin-removal therapy. He adds that he had also never had a patient who followed instructions so religiously, 20 minutes every day at 200 degrees, which may be part of the explanation. By his account, Johnson went from the 95th percentile on seven or eight markers to virtually zero over about three weeks, or 23 sessions.

Johnson reads off some numbers: MEP down 100%, MBP down 15%, MEHP down 100% (undetectable after the sauna period), NAP and HEMA down 56%, and another marker down 100%. Overall he estimates at least a 50% drop across most markers, all compounds that had been raised by the fires. He is careful not to credit sauna alone. The reduction may reflect sauna combined with the Blueprint diet, exercise, sleep, and what he calls the compensatory effects of a body running well.

Mallin fills in the other factors. The Blueprint diet naturally supplies high levels of antioxidants such as vitamin C and N-acetylcysteine, plus cruciferous vegetables and sulfur-containing foods like garlic. These support the body's natural toxin-handling defenses, which work for everything except PFAS. Johnson was also still doing HBOT (hyperbaric oxygen therapy), which Mallin believes likely has similar anti-inflammatory and antioxidant effects that make clearance easier. Johnson points viewers to the Don't Die food guide and the Blueprint supplement stack, adding that they can buy their own versions if they prefer. The last lever is fiber: Mallin says it matters most for PFAS, because it helps stool bind these chemicals and carry them out instead of letting the gut reabsorb them.

Closing: Get the Big Things Right, Don't Despair

Tolo says she feels somewhat reassured. She's sad that there isn't better infrastructure for people to know what is affecting their bodies, and glad that the team's n-of-one experiments are producing new insights. Mallin sees Johnson as evidence of relatively easy, affordable opportunities: water filtration and a stronger HVAC filter such as MERV 13 alone would significantly cut most people's toxin exposure. Tolo returns to the basics. Exercise, sweating, and a high-fiber diet capture most of the benefit, and anyone who does just that is ahead of most of the population, especially in America.

Johnson closes by acknowledging how distressing the topic can be. He recalls the microplastics finding that glass bottles contained five to 50 times more microplastics than plastic bottles. A result like that, he says, can make people feel nothing they do matters and conclude "YOLO." He encourages them instead to treat it as a journey in which the science will change and surprise them. He offers his own example: this week he found out that the towel he used in the sauna was 15% polyester, so he had been wiping toxins onto his body while trying to sweat them out. The advice is to get the big ones right, clean water and clean air, and to avoid toxin spikes you can control, such as fireworks and fast food. Going much further, he says, has limited returns.

He describes two versions of each person: a sober-minded one who wants to be their best self, and one who in the moment decides they deserve fast food because it's Saturday. He urges listeners to make decisions as the first. He did this himself, he says, when he "fired Evening Bryan," the version of himself who would say PFAS is everywhere so there's no point worrying, and took away that version's decision-making power. He ends by saying that collectively people are becoming much more aware of toxins, that culture will change as they make these changes together, and that "we're going to be okay."