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The coronavirus entered Milwaukee from a white, affluent suburb. Then it took root in the city’s black community and erupted.

As public health officials watched cases rise in March, too many in the community shrugged off warnings. Rumors and conspiracy theories proliferated on social media, pushing the bogus idea that black people are somehow immune to the disease. And much of the initial focus was on international travel, so those who knew no one returning from Asia or Europe were quick to dismiss the risk.


Then, when the shelter-in-place order came, there was a natural pushback among those who recalled other painful government restrictions — including segregation and mass incarceration — on where black people could walk and gather.

“We’re like, ‘We have to wake people up,’” said Milwaukee Health Commissioner Jeanette Kowalik.

As the disease spread at a higher rate in the black community, it made an even deeper cut. Environmental, economic and political factors have compounded for generations, putting black people at higher risk of chronic conditions that leave lungs weak and immune systems vulnerable: asthma, heart disease, hypertension and diabetes. In Milwaukee, simply being black means your life expectancy is 14 years shorter, on average, than someone white.

As of Friday morning, African Americans made up almost half of Milwaukee County’s 945 cases and 81% of its 27 deaths in a county whose population is 26% black. Milwaukee is one of the few places in the United States that is tracking the racial breakdown of people who have been infected by the novel coronavirus, offering a glimpse at the disproportionate destruction it is inflicting on black communities nationwide.

In Michigan, where the state’s population is 14% black, African Americans made up 35% of cases and 40% of deaths as of Friday morning. Detroit, where a majority of residents are black, has emerged as a hot spot with a high death toll. As has New Orleans. Louisiana has not published case breakdowns by race, but 40% of the state’s deaths have happened in Orleans Parish, where the majority of residents are black.

Illinois and North Carolina are two of the few areas publishing statistics on COVID-19 cases by race, and their data shows a disproportionate number of African Americans were infected.

“It will be unimaginable pretty soon,” said Dr. Celia J. Maxwell, an infectious disease physician and associate dean at Howard University College of Medicine, a school and hospital in Washington dedicated to the education and care of the black community. “And anything that comes around is going to be worse in our patients. Period. Many of our patients have so many problems, but this is kind of like the nail in the coffin.”

The U.S. Centers for Disease Control and Prevention tracks virulent outbreaks and typically releases detailed data that includes information about the age, race and location of the people affected. For the coronavirus pandemic, the CDC has released location and age data, but it has been silent on race. The CDC did not respond to ProPublica’s request for race data related to the coronavirus or answer questions about whether they were collecting it at all.

Experts say that the nation’s unwillingness to publicly track the virus by race could obscure a crucial underlying reality: It’s quite likely that a disproportionate number of those who die of coronavirus will be black.

The reasons for this are the same reasons that African Americans have disproportionately high rates of maternal death, low levels of access to medical care and higher rates of asthma, said Dr. Camara Jones, a family physician, epidemiologist and visiting fellow at Harvard University.

“COVID is just unmasking the deep disinvestment in our communities, the historical injustices and the impact of residential segregation,” said Jones, who spent 13 years at the CDC, focused on identifying, measuring and addressing racial bias within the medical system. “This is the time to name racism as the cause of all of those things. The overrepresentation of people of color in poverty and white people in wealth is not just a happenstance. … It’s because we’re not valued.”

Five congressional Democrats wrote to Health and Human Services Secretary Alex Azar, whose department encompasses the CDC, last week demanding the federal government collect and release the breakdown of coronavirus cases by race and ethnicity.

Without demographic data, the members of Congress wrote, health officials and lawmakers won’t be able to address inequities in health outcomes and testing that may emerge: “We urge you not to delay collecting this vital information, and to take any additional necessary steps to ensure that all Americans have the access they need to COVID-19 testing and treatment.”

Milwaukee, one of the few places already tracking coronavirus cases and deaths by race, provides an early indication of what would surface nationally if the federal government actually did this, or locally if other cities and states took its lead.

Milwaukee, both the city and county, passed resolutions last summer that were seen as important steps in addressing decades of race-based inequality.

“We declared racism as a public health issue,” said Kowalik, the city’s health commissioner. “It frames not only how we do our work but how transparent we are about how things are going. It impacts how we manage an outbreak.”

Milwaukee is trying to be purposeful in how it communicates information about the best way to slow the pandemic. It is addressing economic and logistical roadblocks that stand in the way of safety. And it’s being transparent about who is infected, who is dying and how the virus spread in the first place.

Kowalik described watching the virus spread into the city, without enough information, because of limited testing, to be able to take early action to contain it.

At the beginning of March, Wisconsin had one case. State public health officials still considered the risk from the coronavirus “low.” Testing criteria was extremely strict, as it was in many places across the country: You had to have symptoms and have traveled to China, Iran, South Korea or Italy within 14 days or have had contact with someone who had a confirmed case of COVID-19.

So, she said, she waited, wondering: “When are we going to be able to test for this to see if it is in our community?”

About two weeks later, Milwaukee had its first case.

The city’s patient zero had been in contact with a person from a neighboring, predominately white and affluent suburb who had tested positive. Given how much commuting occurs in and out of Milwaukee, with some making a 180-mile round trip to Chicago, Kowalik said she knew it would only be a matter of time before the virus spread into the city.

A day later came the city’s second case, someone who contracted the virus while in Atlanta. Kowalik said she started questioning the rigidness of the testing guidelines. Why didn’t they include domestic travel?

By the fourth case, she said, “we determined community spread. … It happened so quickly.”

Within the span of a week, Milwaukee went from having one case to nearly 40. Most of the sick people were middle-aged, African American men. By week two, the city had over 350 cases. And now, there are more than 945 cases countywide, with the bulk in the city of Milwaukee, where the population is 39% black. People of all ages have contracted the virus and about half are African American.

The county’s online dashboard of coronavirus cases keeps up-to-date information on the racial breakdown of those who have tested positive. As of Thursday morning, 19 people had died of illness related to COVID-19 in Milwaukee County. All but four were black, according to the county medical examiner’s office. Records show that at least 11 of the deceased had diabetes, eight had hypertension and 15 had a mixture of chronic health conditions that included heart and lung disease.

Because of discrimination and generational income inequality, black households in the county earned only 50% as much as white ones in 2018, according to census statistics. Black people are far less likely to own homes than white people in Milwaukee and far more likely to rent, putting black renters at the mercy of landlords who can kick them out if they can’t pay during an economic crisis, at the same time as people are being told to stay home. And when it comes to health insurance, black people are more likely to be uninsured than their white counterparts.

African Americans have gravitated to jobs in sectors viewed as reliable paths to the middle class — health care, transportation, government, food supply — which are now deemed “essential,” rendering them unable to stay home. In places like New York City, the virus’ epicenter, black people are among the only ones still riding the subway.

“And let’s be clear, this is not because people want to live in those conditions,” said Gordon Francis Goodwin, who works for Government Alliance on Race and Equity, a national racial equity organization that worked with Milwaukee on its health and equity framework. “This is a matter of taking a look at how our history kept people from actually being fully included.”

Fred Royal, head of the Milwaukee branch of the NAACP, knows three people who have died from the virus, including 69-year-old Lenard Wells, a former Milwaukee police lieutenant and a mentor to others in the black community. Royal’s 38-year-old cousin died from the virus last week in Atlanta. His body was returned home Tuesday.

Royal is hearing that people aren’t necessarily being hospitalized but are being sent home instead and “told to self-medicate.”

“What is alarming about that,” he said, “is that a number of those individuals were sent home with symptoms and died before the confirmation of their test came back.”

Health Commissioner Kowalik said that there have been delays of up to two weeks in getting results back from some private labs, but nearly all of those who died have done so at hospitals or while in hospice. Still, Kowalik said she understood why some members in the black community distrusted the care they might receive in a hospital.

In January, a 25-year-old day care teacher named Tashonna Ward died after staff at Froedtert Hospital failed to check her vital signs. Federal officials examined 20 patient records and found seven patients, including Ward, didn’t receive proper care. The report didn’t reveal the race of those whose records it examined at the hospital, which predominantly serves black patients. Froedtert Hospital declined to speak to issues raised in the report, according to a February article from the Milwaukee Journal Sentinel, and it had not submitted any corrective actions to federal officials.

“What black folks are accustomed to in Milwaukee and anywhere in the country, really, is pain not being acknowledged and constant inequities that happen in health care delivery,” Kowalik said.

The health commissioner herself, a black woman who grew up in Milwaukee, said she’s all too familiar with the city’s enduring struggles with segregation and racism. Her mother is black and her father Polish, and she remembers the stories they shared about trying to buy a house as a young interracial couple in Sherman Park, a neighborhood once off-limits to blacks.

“My father couldn’t get a mortgage for the house. He had to go to the bank without my mom,” Kowalik said.

It is the same neighborhood where fury and frustration sparked protests that, at times, roiled into riots in 2016 when a Milwaukee police officer fatally shot Sylville Smith, a 23-year-old black man.

And it is the same neighborhood that has a concentration of poor health outcomes when you overlay a heat map of conditions, be it lead poisoning, infant mortality — and now, she said, COVID-19.

Knowing which communities are most impacted allows public health officials to tailor their messaging to overcome the distrust of black residents.

“We’ve been told so much misinformation over the years about the condition of our community,” Royal, of the NAACP, said. “I believe a lot of people don’t trust what the government says.”

Kowalik has met — virtually — with trusted and influential community leaders to discuss outreach efforts to ensure everyone is on the same page about the importance of staying home and keeping 6 feet away from others if they must go out.

Police and inspectors are responding to complaints received about “noncompliant” businesses forcing staff to come to work or not practicing social distancing in the workplace. Violators could face fines.

“Who are we getting these complaints from?” she asked. “Many people of color.”

Residents have been urged to call 211 if they need help with anything from finding something to eat or a place to stay. And the state has set up two voluntary isolation facilities for people with COVID-19 symptoms whose living situations are untenable, including a Super 8 motel in Milwaukee.

Despite the work being done in Milwaukee, experts like Linda Sprague Martinez, a community health researcher at Boston University’s School of Social Work, worry that the government is not paying close enough attention to race, and as the disease spreads, will do too little to blunt its toll.

“When COVID-19 passes and we see the losses … it will be deeply tied to the story of post-World War II policies that left communities marginalized,” Sprague said. “Its impact is going to be tied to our history and legacy of racial inequities. It’s going to be tied to the fact that we live in two very different worlds.”

Update, April 3, 2020: This story has been updated to reflect that Illinois and North Carolina are breaking coronavirus cases down by race.

This article originally appeared on ProPublica. You can read it here.

  • Why ‘unwinding’ with screens may be making us more stressed – here’s what to try instead
    Photo credit: Riska/E+ via Getty Images Using multiple digital devices at once can be highly distracting and overstimulating.

    As Americans increasingly report feeling overwhelmed by daily life, many are using self-care to cope. Conversations and social media feeds are saturated with the language of “me time,” burnout, boundaries and nervous system regulation.

    To meet this demand, the wellness industry has grown into a multitrillion-dollar global market. Myriad providers offer products, services and lifestyle prescriptions that promise calm, balance and restoration.

    Paradoxically, though, even as interest in self-care continues to grow, Americans’ mental health is getting worse.

    I am a professor of public health who studies health behaviors and the gap between intentions and outcomes. I became interested in this self-care paradox recently, after I suffered from a concussion. I was prescribed two months of strictly screen-free cognitive rest – no television, email, Zooming, social media, streaming or texting.

    The benefits were almost immediate, and they surprised me. I slept better, had a longer attention span and had a newfound sense of mental quiet. These effects reflected a well-established principle in neuroscience: When cognitive and emotional stimuli decrease, the brain’s regulatory systems can recover from overload and chronic stress.

    Obviously, most people can’t go 100% screen-free for days, much less months, but the underlying principle offers a powerful lesson for practicing effective self-care.

    A nation under strain

    Americans’ self-rated mental health is now at the lowest point since Gallup started tracking this issue in 2001. National surveys consistently detect high levels of stress and emotional strain.

    Roughly one-third of U.S. adults report feeling overwhelmed most days. Sleep disruption, anxiety, poor concentration and emotional exhaustion are widespread, particularly among young adults and women.

    Chronic disease patterns mirror this strain. When daily stress becomes chronic, it can trigger biological changes that increase the risk of long-term conditions like heart disease and diabetes. The Centers for Disease Control and Prevention reports that 6 in 10 U.S. adults live with at least one chronic condition, and 4 in 10 live with multiple chronic conditions.

    How people try to cope

    Many Americans say they actively practice self-care in everyday life. For example, they describe taking mental health days, protecting personal time, setting boundaries around work and prioritizing rest and leisure.

    The problem lies in how they use that leisure time.

    Over the past 22 years, the U.S. Bureau of Labor Statistics’ American Time Use Survey has consistently found that watching television is the most popular leisure activity for U.S. adults. Americans spend far more time watching TV than exercising, spending time with friends or practicing reflection through activities like yoga. Other common self-care activities include watching movies and gaming.

    Modern leisure time increasingly includes smartphone use. Surveys suggest that mobile phones have become the dominant screen for many Americans, with adults spending several hours per day on their phones.

    For many adults, checking social media or watching short videos has become a default relaxation behavior layered on top of traditional screen use. This practice is often referred to as second screening.

    Although many people turn to screen-based activities to wind down, these activities may have the opposite effect biologically.

    Why modern screen use feels different

    Pre-internet forms of leisure often involved activities such as watching scheduled television programs, listening to radio broadcasts or reading books and magazines. For all of these pastimes, the content followed a predictable sequence with natural stopping points.

    Today’s digital media environment looks very different. People routinely engage with multiple screens at once, respond to frequent notifications and switch rapidly between several streams of content. These environments continuously require users to split their attention, engage their emotions and make decisions.

    This type of mental multitasking draws on the same neural systems people are often attempting to rest with leisure. The result is a far more fragmented and cognitively demanding environment than in the past.

    Americans now spend approximately six to seven hours per day on screens across multiple devices. Splitting attention between more than one screen at a time, such as using the phone while watching television, is common. This juggling exposes peoples’ brains to multiple streams of sensory and emotional input simultaneously.

    Survey data also suggests that Americans may check their phones roughly 200 times per day. In doing so, they repeatedly pull their attention back to screens during routine moments.

    Modern digital platforms are designed to maximize engagement. Algorithms tend to prioritize emotionally arousing content, particularly anger, anxiety and outrage. These feelings drive clicks, sharing and time spent on platforms. Research has shown that this design is associated with higher stress, distraction and cognitive load.

    When ‘rest’ doesn’t restore

    Against the backdrop of daily hassles and competing demands, it can feel like relief to flip on the TV. Practices such as streaming or so-called bed-rotting – spending extended periods in bed while scrolling – often are framed as a form of radical rest or self-care.

    Other common coping behaviors include leaving the television on as background noise, scrolling between tasks throughout the day or using phones during meals and conversations. These strategies can feel restful because they temporarily reduce external demands and decision-making.

    However, pairing rest with screen use may undermine the very restoration that people are seeking. Digital media stimulate attention, emotion and sensory processing. Even while people are sitting or lying still, being onscreen can keep their nervous systems in a heightened state of arousal. It may look like downtime, but it doesn’t create the biological conditions for restoration.

    How to wind down

    Evidence suggests that mental relief comes not from adding new coping strategies, but from reducing the number of demands placed on the brain.

    Here are some evidence-based strategies that support genuine restoration:

    The goal is to intentionally reduce mental load, not to abandon all digital devices.

    To improve well-being in our overstimulated society, it’s important to understand the difference between feeling as though you are unwinding and actually allowing your brain and body to recover. In my view, fewer screens, fewer inputs, fewer emotional demands and more protected time for genuine cognitive rest are important components of an effective wellness strategy.

    This article originally appeared on The Conversation. You can read it here.

  • Antibiotic resistance could undo a century of medical progress – but four advances are changing the story
    Photo credit: wildpixel/iStock via Getty Images Plus Scientists are fighting back against antibiotic resistance with new strategies and tools.

    Imagine going to the hospital for a bacterial ear infection and hearing your doctor say, “We’re out of options.” It may sound dramatic, but antibiotic resistance is pushing that scenario closer to becoming reality for an increasing number of people. In 2016, a woman from Nevada died from a bacterial infection that was resistant to all 26 antibiotics that were available in the United States at that time.

    The U.S. alone sees more than 2.8 million antibiotic-resistant illnesses each year. Globally, antimicrobial resistance is linked to nearly 5 million deaths annually.

    Bacteria naturally evolve in ways that can make the drugs meant to kill them less effective. However, when antibiotics are overused or used improperly in medicine or agriculture, these pressures accelerate the process of resistance.

    As resistant bacteria spread, lifesaving treatments face new complications – common infections become harder to treat, and routine surgeries become riskier. Slowing these threats to modern medicine requires not only responsible antibiotic use and good hygiene, but also awareness of how everyday actions influence resistance.

    Since the inception of antibiotics in 1910 with the introduction of Salvarsan, a synthetic drug used to treat syphilis, scientists have been sounding the alarm about resistance. As a microbiologist and biochemist who studies antimicrobial resistance, I see four major trends that will shape how we as a society will confront antibiotic resistance in the coming decade.

    1. Faster diagnostics are the new front line

    For decades, treating bacterial infections has involved a lot of educated guesswork. When a very sick patient arrives at the hospital and clinicians don’t yet know the exact bacteria causing the illness, they often start with a broad-spectrum antibiotic. These drugs kill many different types of bacteria at once, which can be lifesaving — but they also expose a wide range of other bacteria in the body to antibiotics. While some bacteria are killed, the ones that remain continue to multiply and spread resistance genes between different bacterial species. That unnecessary exposure gives harmless or unrelated bacteria a chance to adapt and develop resistance.

    In contrast, narrow-spectrum antibiotics target only a small group of bacteria. Clinicians typically prefer these types of antibiotics because they treat the infection without disturbing bacteria that are not involved in the infection. However, it can take several days to identify the exact bacteria causing the infection. During that waiting period, clinicians often feel they have no choice but to start broad-spectrum treatment – especially if the patient is seriously ill.

    Close-up of two pill capsules inscribed AOMXY 500 in a blister packet
    Amoxicillin is a commonly prescribed broad-spectrum antibiotic. TEK IMAGE/Science Photo Library via Getty Images

    But new technology may fast-track identification of bacterial pathogens, allowing medical tests to be conducted right where the patient is instead of sending samples off-site and waiting a long time for answers. In addition, advances in genomic sequencingmicrofluidics and artificial intelligence tools are making it possible to identify bacterial species and effective antibiotics to fight them in hours rather than days. Predictive tools can even anticipate resistance evolution.

    For clinicians, better tests could help them make faster diagnoses and more effective treatment plans that won’t exacerbate resistance. For researchers, these tools point to an urgent need to integrate diagnostics with real-time surveillance networks capable of tracking resistance patterns as they emerge.

    Diagnostics alone will not solve resistance, but they provide the precision, speed and early warning needed to stay ahead.

    2. Expanding beyond traditional antibiotics

    Antibiotics transformed medicine in the 20th century, but relying on them alone won’t carry humanity through the 21st. The pipeline of new antibiotics remains distressingly thin, and most drugs currently in development are structurally similar to existing antibiotics, potentially limiting their effectiveness.

    To stay ahead, researchers are investing in nontraditional therapies, many of which work in fundamentally different ways than standard antibiotics.

    One promising direction is bacteriophage therapy, which uses viruses that specifically infect and kill harmful bacteria. Others are exploring microbiome-based therapies that restore healthy bacterial communities to crowd out pathogens.

    Researchers are also developing CRISPR-based antimicrobials, using gene-editing tools to precisely disable resistance genes. New compounds like antimicrobial peptides, which puncture the membranes of bacteria to kill them, show promise as next-generation drugs. Meanwhile, scientists are designing nanoparticle delivery systems to transport antimicrobials directly to infection sites with fewer side effects.

    Beyond medicine, scientists are examining ecological interventions to reduce the movement of resistance genes through soil, wastewater and plastics, as well as through waterways and key environmental reservoirs.

    Many of these options remain early-stage, and bacteria may eventually evolve around them. But these innovations reflect a powerful shift: Instead of betting on discovering a single antibiotic to address resistance, researchers are building a more diverse and resilient tool kit to fight antibiotic-resistant pathogenic bacteria.

    3. Antimicrobial resistance outside hospitals

    Antibiotic resistance doesn’t only spread in hospitals. It moves through people, wildlife, crops, wastewater, soil and global trade networks. This broader perspective that takes the principles of One Health into account is essential for understanding how resistance genes travel through ecosystems.

    Researchers are increasingly recognizing environmental and agricultural factors as major drivers of resistance, on par with misuse of antibiotics in the clinic. These include how antibiotics used in animal agriculture can create resistant bacteria that spread to people; how resistance genes in wastewater can survive treatment systems and enter rivers and soil; and how farms, sewage plants and other environmental hot spots become hubs where resistance spreads quickly. Even global travel accelerates the movement of resistant bacteria across continents within hours.

    Together, these forces show that antibiotic resistance isn’t just an issue for hospitals – it’s an ecological and societal problem. For researchers, this means designing solutions that cross disciplines, integrating microbiology, ecology, engineering, agriculture and public health.

    4. Policies on what treatments exist in the future

    Drug companies lose money developing new antibiotics. Because new antibiotics are used sparingly in order to preserve their effectiveness, companies often sell too few doses to recoup development costs even after the Food and Drug Administration approves the drugs. Several antibiotic companies have gone bankrupt for this reason.

    To encourage antibiotic innovation, the U.S. is considering major policy changes like the PASTEUR Act. This bipartisan bill proposes creating a subscription-style payment model that would allow the federal government up to US$3 billion to pay drug manufacturers over five to 10 years for access to critical antibiotics instead of paying per pill.

    Global health organizations, including Médecins Sans Frontières (Doctors Without Borders), caution that the bill should include stronger commitments to stewardship and equitable access.

    Still, the bill represents one of the most significant policy proposals related to antimicrobial resistance in U.S. history and could determine what antibiotics exist in the future.

    The future of antibiotic resistance

    Antibiotic resistance is sometimes framed as an inevitable catastrophe. But I believe the reality is more hopeful: Society is entering an era of smarter diagnostics, innovative therapies, ecosystem-level strategies and policy reforms aimed at rebuilding the antibiotic pipeline in addition to addressing stewardship.

    For the public, this means better tools and stronger systems of protection. For researchers and policymakers, it means collaborating in new ways.

    The question now isn’t whether there are solutions to antibiotic resistance – it’s whether society will act fast enough to use them.

    This article originally appeared on The Conversation. You can read it here.

  • HEPA air purifiers may boost brain power in adults over 40 – new research
    Photo credit: Jomkwan/iStock via Getty Images PlusAir pollution can negatively affect the brain.

    Using an in-home HEPA purifier for one month spurs a small but significant improvement in brain function in adults age 40 and older. That’s the result of a new study we co-authored in the journal Scientific Reports.

    HEPA purifiers – HEPA stands for high efficiency particulate air – remove particulate matter from the air. Exposure to particulate matter has been connected to respiratory and cardiovascular illnesses as well as neurological diseases such as Alzheimer’s and Parkinson’s. Environmental health researchers increasingly recommend that people use HEPA air purifiers in their homes to lower their exposure to particulate matter, but few studies have examined whether using them boosts mental function.

    We analyzed data from a study of 119 people ages 30 to 74 living in Somerville, Massachusetts. Somerville sits along Interstate 93 and Route 28, two major highways, resulting in relatively high levels of traffic-related air pollution. This makes it an especially good location for testing the health effects of air purifiers.

    We randomly assigned participants to one of two groups. One used a HEPA air purifier for one month and then a sham air purifier – which looked and acted like the real thing but did not contain the air-cleaning filter – for one month, with a month-long break in between. The second group used the real and sham purifiers in reverse order.

    After each month, participants took a test that measured different aspects of their mental capacity. The test probed people’s visual memory and motor speed skills by measuring how quickly they could draw lines between sequential numbers, and it tested executive function and mental flexibility by asking them to draw lines between alternating sequential numbers and letters.

    We found that participants 40 years and older – about 42% of our sample – on average completed the section testing for mental flexibility and executive function 12% faster after using the HEPA purifier than after using the sham purifier. That was true even when we accounted for factors like differences in the amount of time participants spent indoors, with either filter, as well as how stressful they found the test.

    This improvement may seem small, but it is similar to the cognitive benefits that people experience from increasing their daily exercise. While you may not experience a sudden increase in clarity from a 12% boost, preventing cognitive decline is vital for long-term well-being. Even small decreases in cognitive functioning may be associated with a higher risk of death.

    Why it matters

    Air pollution can negatively affect mental function after just a few hours of exposure. Studies show that air purifiers are effective at reducing particulates, but it’s unclear whether these reductions can prevent cognitive harm from ongoing pollution sources like traffic. Research has been especially lacking in people living near major sources of air pollution, such as highways.

    People living near highways or major roadways are exposed to more air pollution and also experience higher rates of air pollution-related diseases. These risks aren’t encountered by all Americans equally: People of color and low-income people are more likely to live near highways or areas with heavy traffic.

    Our study shows that HEPA air purifiers may offer meaningful health benefits under these circumstances.

    What still isn’t known

    Research shows that air pollution begins to affect cognitive function especially strongly around age 40. These effects may become increasingly prominent as people age.

    HEPA air purifiers may therefore be especially beneficial for older adults. Our study did not explore this possibility, as fewer than 10 of our 119 participants were over the age of 60.

    Also, our participants only used a HEPA air purifier for one month. It’s possible that longer durations of air purification may sustain or even increase the improvement in cognitive function we observed in our study.

    Finally, it is unclear exactly how air purifiers improve cognition. Some studies suggest that exposure to particulate matter reduces the amount of the brain’s white matter, which helps brain cells conduct electrical signals and maintains connections between brain regions. The brain regions most harmed by air pollution are the ones that control mental flexibility and executive function, the same domains in which we saw improvements in our study.

    We plan to study whether reducing particulate matter by using air purifiers is indeed protecting the brain’s white matter, and whether it could reverse some cognitive decline. We will explore that possibility by studying how levels of molecules called metabolites, which cells produce as they do their jobs, change in response to breathing polluted air and air cleaned by a HEPA filter.

    This article originally appeared on The Conversation. You can read it here.

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