Researchers at Mount Sinai say they have uncovered new evidence renewing the link between 9/11 toxic dust and a higher risk of heart disease.
Scientists analyzed data collected from 800 first responders between January 2011 and September of last year.
They found participants with higher levels of exposure to dust clouds at the World Trade Center site were more likely to suffer from sleep apnea and post traumatic stress disorder.
Both conditions can lead to a higher risk of heart disease.
Researchers had previously linked the toxic dust to lung, heart and kidney abnormalities.