The federal program that monitors 9/11 health effects is preparing to launch the first large research effort focused on people who were children, teenagers, young adults, or still in the womb when the World Trade Center collapsed. The CDC said last month it will seek applications from researchers to set up a World Trade Center Youth Research Coordinating Center and to identify and follow a Youth Research Cohort, Reuters reported.
The step arrives on the eve of the attacks' 25th anniversary and targets a long-recognized gap. Roughly 25,000 children were living or attending school near lower Manhattan on Sept. 11, 2001, and thousands more lived in surrounding neighborhoods. Very few were enrolled in the government-funded follow-up studies, which focused mainly on first responders and adult survivors.
For families who lived downtown or in Brooklyn at the time, the question is practical and personal. Those children are now in their 30s and early 40s, the age when some chronic diseases begin to appear. Scientists still cannot say whether their early exposure changed their long-term risk.
A Research Gap That Lasted a Generation
The collapse released a massive cloud and settling dust containing pulverized concrete, glass fibers, asbestos, and other pollutants. More than 1,500 scientific publications have since documented health effects among exposed populations, including lung and upper airway disease, digestive conditions, several cancers, and mental health disorders, according to a NIOSH Science Bulletin released in August.
Only a small share of that research has focused on people exposed at a young age. The bulletin, written by leaders of the World Trade Center Health Program, including Administrator Dr. John Howard, notes that children take in larger exposures relative to their body size, clear harmful chemicals less efficiently, and are exposed during periods of rapid growth and development.
Congress moved to address the gap in 2022 by directing the program to establish a research cohort of people who were 21 or younger at the time of exposure. The program reported in a program update that it had entered a community engagement phase of a four-phase plan. Four years after Congress acted, the coordinating center is still at the application stage.
Who May Qualify and What Researchers Want to Learn
According to Reuters, the CDC has specified that participants must have been 21 or younger, or in utero, and living below 14th Street in Manhattan or anywhere in Brooklyn on and after 9/11. A comparison group of similarly aged but unexposed people will also be recruited.
The NIOSH bulletin lists priority research areas: respiratory health and lung development, reproductive health, brain development and mental health, metabolic disorders, heart and blood vessel disease, and cancer and other chronic diseases.
Earlier monitoring of children was limited. The New York City World Trade Center Health Registry enrolled about 3,100 people who were children at the time, including 2,379 who lived and 753 who attended school south of Canal Street, according to an earlier NIOSH summary. That group has produced studies on asthma, reproductive outcomes, and other conditions, but it represents a fraction of the exposed population.
Former Downtown Children and Their Families Face Open Questions
Dr. Joan Reibman, a lung specialist at NYU Langone and founder of the World Trade Center Environmental Health Center, said many exposed children received care from their own pediatricians rather than from federal programs, which left them outside research records.
"These people are spread across the United States right now. They're all older. They may not necessarily want to go back to that period of time," Reibman told Reuters. "There's going to have to be a lot of work with community groups to try to recruit them."
Dr. Leigh Wilson, the center's current medical director, said studying this group may point to preventive measures and resources for children exposed to disasters elsewhere. Both physicians noted that children in war zones today may face similar long-term consequences.
The limits of this announcement matter. No new health finding has been released. The cohort does not yet exist, and it is not known how many people the CDC hopes to enroll, how much funding is available, or when a formal request for proposals will be issued. Any link between childhood exposure and later disease remains unproven until researchers collect and analyze the data.
Care and Registration Options Available Now
People exposed as children do not have to wait for the study to seek care. The World Trade Center Health Program already provides monitoring and treatment for certified 9/11-related conditions among eligible survivors, including people who lived, worked, or attended school in the New York City disaster area. Former residents who have moved away can ask about the program's nationwide provider network.
Anyone with persistent breathing problems, chronic sinus or reflux symptoms, or a cancer diagnosis should tell their clinician about their 9/11 exposure history. Documentation such as old leases, school enrollment records, or registry participation can help establish eligibility. Sudden shortness of breath or chest pain requires emergency care regardless of exposure history.
The program invites people who were 21 or younger at the time of exposure to sign up for email updates on the cohort, and the NIOSH bulletin says details on how to take part will be shared as soon as they are available.
"You have to identify and start studying all exposed populations immediately, whether they're adults or children," Reibman said, adding that "unfortunately we haven't learned it from the World Trade Center disaster."
The bottom line is that federal researchers are finally preparing to study the children of 9/11, but answers are likely years away. Former downtown and Brooklyn residents can register for updates now and should make sure their doctors know their exposure history.
Key Questions Answered
What is the new 9/11 youth study? The CDC's World Trade Center Health Program plans to fund a research coordinating center to identify and follow people who were exposed to 9/11 at age 21 or younger, including those in utero.
Who may be eligible to participate? According to Reuters, the CDC has specified people who were 21 or younger, or in utero, and living below 14th Street in Manhattan or anywhere in Brooklyn on and after 9/11.
How many children were exposed? Roughly 25,000 children lived or attended school near lower Manhattan on Sept. 11, 2001, with thousands more in surrounding neighborhoods.
What health problems will researchers study? Priority areas include lung development, reproductive health, brain development and mental health, metabolic disorders, heart disease, and cancer.
Has the study found any health effects yet? No. The cohort has not been formed, and funding, size, and timing have not been announced.
Can people exposed as children get care now? Eligible survivors can apply to the World Trade Center Health Program, which provides monitoring and treatment for certified 9/11-related conditions.
How can someone stay informed? The WTC Health Program offers email updates for people who were 21 or younger at exposure and will share participation details when available.
