NEW YORK, NY — Twenty-five years after the 9/11 attacks, the first images remain seared into memory: the plane impacts, the smoke and the survivors covering their faces against the dust. What followed, however, has become an even larger story of loss.
Newly released city documents and health figures underscore how exposure to toxic air after the attacks has contributed to illnesses and deaths for thousands of people. New York Mayor Zohran Mamdani said the city’s records show officials misled residents about the air they were breathing in the days after the attacks.
He said the long-term toll now exceeds the death count from the attacks themselves, as more people have died from 9/11-related illnesses over time. The city’s release of documents is adding new attention to a public-health disaster that unfolded long after the smoke cleared.
Dust, debris and chemicals spread through lower Manhattan
When the twin towers were struck, massive dust clouds moved through lower Manhattan and left blocks coated in ash and debris. The contamination included asbestos, silica, metals, concrete and glass, according to the information released by the city.
Fires that continued to burn at Ground Zero for months added more harmful byproducts to the air. The exposure was not limited to the immediate site. Other parts of lower Manhattan also recorded asbestos and other contaminants, in some cases above acceptable levels, the newly released documents said.
The city’s figures show how far the effects spread beyond the World Trade Center footprint. Residents, workers and first responders were all among those who encountered the polluted environment in the days and months after the attacks.
Firefighters and responders carried a heavy share of the exposure
One of the most devastating parts of the aftermath was the impact on emergency workers. On Sept. 11, 343 New York City Fire Department members died. In the months that followed, more than 15,000 firefighters, EMS providers and civilian personnel, both active and retired, were exposed to dust, gases, fibers and other contaminants at the World Trade Center site.
Those exposures are now tied to a wide range of illnesses. The city’s newly highlighted records and health data show that the danger did not end when rescue and recovery operations began. For many responders, the work of helping others left them facing their own long-term medical battle.
The release also reflects a broader recognition that the attacks created lasting risks for people who were nowhere near the impact zone at the moment of collapse but were still present in the contaminated area afterward.
Cancer diagnoses and health program enrollment keep rising
According to the 9/11 Memorial, 49,000 people have been diagnosed with cancers related to the World Trade Center exposure. That list includes blood, digestive, ovarian and lung cancers, as well as mesothelioma and other diseases.
At least 140,000 people have enrolled in the World Trade Center Health Program, which monitors and treats conditions tied to the attacks. Even with that large number of patients, more people remain eligible for help, showing that the affected population is broader than the current enrollment totals suggest.
The CDC estimates that about 400,000 people were exposed to toxic contaminants, along with the risk of physical injury and emotionally stressful conditions in the days, weeks and months after the attacks. That estimate helps explain why the medical impact has continued to grow for so many years.
Ground Zero remembrance now includes a seventh moment of silence
This year’s 9/11 commemoration at Ground Zero will mark the health toll in a new way. For the first time, the ceremony will include a seventh moment of silence to remember those who have died from diseases linked to the attacks.
The addition is intended to recognize how many lives have been lost long after the original tragedy. It is also a sign that the meaning of remembrance has expanded beyond the victims killed on Sept. 11, 2001, to include the later deaths connected to the toxic aftermath.
That shift is notable because it places illness and delayed mortality alongside the immediate loss of life. It also reflects the scale of the suffering that has followed the attacks, especially for families who have spent years dealing with cancers and other conditions.
A national memory shaped by loss, illness and exposure
The attacks killed 2,977 people in New York, at the Pentagon and in Shanksville, Pennsylvania. But the aftereffects continue to reshape how Americans understand 9/11, especially as more deaths are linked to the illnesses that followed toxic exposure.
One striking figure in that long accounting is that 20% of Americans say they knew someone who was hurt or killed in the attacks. That number helps explain why the event remains so deeply personal for so many people across the country.
As the years pass, the scale of the health impact has become part of the historical record. The newly released city documents, the memorial’s cancer figures and the health program enrollment totals all point to the same conclusion: the tragedy did not end on the day the towers fell.
