Parents were also outraged that it took school officials seven months to notify parents.
Chancellor Dennis Walcott acknowledged mistakes and promised to change district procedures.
But that wasn't enough to satisfy some parents who are concerned that the health of their children has been put at risk.
Inside PS 51, DOE testing discovered unacceptable levels of a dangerous chemical called trichloroethylene, or TCE.
According to the Environmental Protection Agency, it can cause dizziness, headaches, and even cancer.
But during the meeting, school officials admitted that they still don't fully know the health risks, but are trying to develop a plan.
Without concrete information, parents like Temika James worries about her daughter's headaches.
"My daughter came home and passed out," James said.
The school will now be moving to a new building at 695 East 182nd Street. That did not sit well with some parents who will now have to travel longer distances to take their kids to school.