What's Happening
More than two decades after the September 11 attacks, the U.S. government is finally preparing a major long-term health study of people who were children, teenagers, infants or even still in the womb when the World Trade Center towers collapsed.
Around 25,000 children were living or attending school in lower Manhattan on September 11, 2001, with thousands more in surrounding areas. Many were exposed to the massive dust and toxic cloud released when the towers collapsed, which contained pulverized concrete, glass fibers, asbestos and other pollutants. (Reuters)
Yet most federal studies following people exposed to the World Trade Center disaster focused on first responders and other adults. As a result, scientists have had limited long-term data on what childhood exposure may mean for health decades later. (Reuters)
That is now set to change.
Congress approved funding for a dedicated study in 2022, and the Centers for Disease Control and Prevention is moving ahead with the project. The program could receive up to $50 million in total funding, with an estimated start date of July 1, 2027. (Reuters)
A Generation Was Exposed but Never Properly Tracked
Children experienced the disaster differently from adults
The people included in the upcoming study were at very different stages of childhood when the attacks occurred.
Some were already attending school in lower Manhattan.
Some were babies or toddlers.
Some were still developing in the womb.
That matters because exposure during childhood can potentially have different long-term effects from exposure during adulthood. Children are still developing physically and neurologically, while infants and fetuses may be particularly vulnerable during critical stages of development. (Reuters)
Despite those differences, relatively few children were enrolled in long-term government studies after the attacks.
Most Children Received Care Through Regular Healthcare
Routine pediatric care filled the gap
Dr. Joan Reibman of NYU Langone Medical Center said many affected children received care from their own pediatricians rather than through the specialized World Trade Center health programs.
Adults were more likely to rely on those government-supported programs, particularly because many adult survivors were uninsured. (Reuters)
That created an important data gap.
Children may have continued receiving healthcare for years, but their health records were not necessarily integrated into a dedicated research program tracking long-term consequences of 9/11 exposure.
Scientists Now Want to Understand the Long-Term Effects
Chronic diseases may only be emerging now
The lack of long-term data is becoming more significant as this population ages.
The children exposed to the disaster in 2001 are now reaching their 30s and early 40s, the period when a number of chronic diseases can begin to emerge. (Reuters)
Researchers specifically want to understand whether exposure to the toxic environment and the trauma associated with the attacks could have increased the risk of conditions such as:
- Cancer
- Cardiovascular disease
- Reproductive-health problems
- Other chronic illnesses (Reuters)
The study is intended to provide the evidence needed to answer those questions.
The New Study Will Compare Exposed and Unexposed People
A dedicated youth cohort is being created
The CDC is seeking researchers to establish a World Trade Center Youth Research Coordinating Center and develop a Youth Research Cohort. (Reuters)
The study will include people who:
- Were 21 years old or younger, or in utero, on or after September 11, 2001
- Were living below 14th Street in Manhattan or anywhere in Brooklyn during that period (Reuters)
Researchers will also recruit a group of people of similar ages who were not exposed to the World Trade Center disaster.
That comparison group is important because it will allow scientists to determine whether health outcomes in the exposed population differ meaningfully from those seen in people who did not experience the same exposure. (Reuters)
The CDC Still Has to Determine How Many People Will Participate
Recruitment will be difficult
The CDC has not yet said exactly how many participants it hopes to enroll.
That is partly because the affected population is now spread throughout the United States, more than 25 years after the attacks. (Reuters)
Many of the people who were children in 2001 have grown up, moved away from New York and built entirely different lives.
Researchers also face another challenge: some potential participants may not want to revisit a traumatic period from their childhood.
Dr. Reibman said extensive community outreach will likely be necessary to find and recruit them. (Reuters)
The Health Program Existed, but Children Were Underrepresented
Existing World Trade Center programs were not enough
The World Trade Center Health Program and the New York City Department of Health's World Trade Center Health Registry did provide services to children during the years after the attacks.
However, the coverage was different from the long-term research infrastructure that existed for many adult survivors and first responders. (Reuters)
The new study is specifically designed to fill that gap.
Instead of relying only on people who sought treatment through an existing health program, researchers will actively identify and track the people who were children during the disaster.
Adult Survivors Have Already Shown Significant Health Effects
Childhood data are the missing piece
Scientists already know considerably more about the long-term health effects experienced by adult survivors and first responders.
Research has identified dozens of types of cancer and other health conditions among adults exposed to the World Trade Center disaster. (Reuters)
But researchers have only had relatively small studies to draw on when examining childhood exposure.
That means the new cohort could help answer whether the health patterns observed in adults also appear among people who were exposed at younger ages.
Children May Have Unique Long-Term Risks
Developmental timing matters
A major scientific question is whether exposure during childhood or before birth changes the type or severity of potential health consequences.
Children's bodies and organs are still developing. The immune system, lungs, brain and reproductive system all change substantially throughout childhood and adolescence.
As a result, scientists cannot simply assume that health outcomes seen in adult first responders will be identical for children who experienced the same environmental exposure.
The new study is intended to produce evidence specific to that population rather than relying on assumptions based on adult data.
The Study Could Help Inform Future Disaster Response
The lessons extend beyond 9/11
Researchers say the project could have implications far beyond the people exposed to the World Trade Center.
Dr. Leigh Wilson, medical director of the World Trade Center Environmental Health Center, said studying this population could help identify preventive and mitigating measures that could be used for people exposed to similar disasters. (Reuters)
That is particularly relevant because children today can be exposed to toxic environments after natural disasters, industrial accidents, armed conflicts and other large-scale emergencies.
The 9/11 cohort could therefore become an important source of information about how childhood exposure to environmental toxins and trauma affects health decades later.
Researchers Say Future Exposures Need to Be Studied Immediately
Waiting decades creates major data gaps
Reibman argued that exposed populations should be identified and studied immediately after a disaster, rather than waiting until people begin developing chronic diseases decades later. (Reuters)
That point is central to the new study.
Researchers are now trying to reconstruct health histories more than two decades after the exposure occurred.
Many relevant details may have been lost, records may exist across different healthcare systems and participants may not remember precisely what they experienced.
Earlier enrollment would have made it easier to establish baseline health and track changes over time.
Mental Trauma Is Another Dimension
Psychological impacts intersect with physical exposure
The project will not only be about physical exposure.
Children who experienced the September 11 attacks and their aftermath also experienced trauma, and scientists want to understand how that trauma may interact with physical exposure to affect long-term health. (Reuters)
That makes this a particularly complex population to study.
Researchers need to distinguish among potential effects from:
- Environmental toxins
- Physical exposure to dust and pollutants
- Psychological trauma
- Socioeconomic changes
- Other life experiences occurring over the following decades
Long-term cohort research can help researchers separate some of these factors by collecting detailed information across many years.
Recruiting Participants Will Be One of the Biggest Challenges
Community support will be critical
Because participants are now adults and geographically dispersed, researchers will need to reconnect with people who may have had no contact with World Trade Center health programs for years.
Community organizations are expected to play an important role in recruitment. (Reuters)
Researchers will also need to make participation worthwhile and understandable for people who may have moved on from the events psychologically as well as geographically.
The success of the study will depend heavily on how many eligible participants can actually be found and retained over time.
The Federal Government Will Spend Up to $50 Million
This is a major research investment
The CDC expects the project to receive up to $50 million in total program funding. (Reuters)
That makes it a substantial federal investment in a population that has historically been underrepresented in World Trade Center health research.
The funding will support the research infrastructure needed to establish the cohort, coordinate participating researchers and track participants over time.
Why This Matters
The study addresses a major gap in U.S. public-health research.
Thousands of people were exposed to the World Trade Center disaster during childhood, but there has been no large, long-term study capable of determining whether that exposure changed their health trajectories.
Now, more than 25 years after the attacks, researchers finally have an opportunity to systematically study that generation as they enter adulthood and middle age. (Reuters)
The importance goes beyond historical accountability.
The results could help doctors better recognize potential long-term effects of childhood disaster exposure and could help public-health agencies design better monitoring programs after future disasters.
Looking Ahead
Next steps for the CDC and researchers
The CDC is currently seeking researchers to establish the youth research center and build the study cohort. The estimated program start date is July 1, 2027. (Reuters)
The immediate challenge will be identifying and recruiting eligible participants and developing a comparison population.
Once the cohort is established, researchers can begin collecting health information and tracking participants over time.
The most important findings may take years to emerge because some chronic conditions develop slowly.
The study therefore represents not just a one-time research project, but the beginning of a long-term health surveillance effort for a population that has never been adequately followed.
Key Takeaways
- Around 25,000 children were living or attending school near lower Manhattan when the World Trade Center towers fell on September 11, 2001. (Reuters)
- Thousands more children lived in surrounding neighborhoods, and some exposed individuals were infants or still in the womb.
- Many were exposed to a toxic cloud and dust containing pulverized concrete, glass fibers, asbestos and other pollutants. (Reuters)
- Most long-term government World Trade Center health studies focused on first responders and adults, leaving a major gap in childhood exposure data.
- Congress approved funding for a dedicated study in 2022.
- The CDC is now establishing a World Trade Center Youth Research Coordinating Center and Youth Research Cohort. (Reuters)
- Eligible participants will have been 21 or younger, or in utero, and living below 14th Street in Manhattan or anywhere in Brooklyn around 9/11. (Reuters)
- Researchers will also recruit a similarly aged unexposed comparison group.
- The CDC expects to spend up to $50 million on the program.
- The project is currently expected to begin around July 1, 2027. (Reuters)
- Scientists want to study possible long-term effects including cancer, cardiovascular disease and reproductive-health outcomes. (Reuters)
- Researchers say recruiting participants will require substantial community outreach, because the population is now spread across the country.
- The study could provide lessons for how governments monitor children exposed to future environmental disasters and traumatic events.
What This Means for Healthcare Marketers
This is a strong example of how long-term health data can uncover unmet needs that are invisible in short-term healthcare data.
For healthcare organizations, a population may appear relatively healthy immediately after an exposure, while chronic conditions emerge decades later. That makes longitudinal health records, cohort studies and population-level monitoring valuable sources of market intelligence.
The broader lesson is especially relevant for healthcare companies working in chronic disease, oncology, cardiovascular care, reproductive health and preventive medicine. When a previously under-studied population begins entering an age range where chronic conditions emerge, new patterns of healthcare demand can become visible.
In this case, the new study could finally reveal whether a generation exposed to 9/11 as children carries distinct long-term health risks, creating a much clearer picture of where healthcare needs may emerge over time.