A new World Trade Center Health Registry survey released Wednesday shows that children who were exposed to the toxic dust on September 11th, 2001 following the terrorist attacks have more breathing problems.

The Health Registry says out of the 3,000 children who were exposed to the dust, more than half of them developed respiratory problems.

Parents NY1 spoke to expressed mixed emotions about the findings.

"I'm not surprised at all,” said one parent. “I just want to know what's the next step after that? Now that the found out this, what is the next step?"

"Now I think my child was very at risk, considering everything we were breathing at the time, I would say he was incredibly at risk and we should have left at the time, so I'm grateful that he doesn't have asthma or any problems associated with it,” said another. “But I'm surprised that he doesn't."

Health issues associated with inhaling the dust range from a persistent cough to bad cases of asthma.