ABCNews.com - "9-11 Dust Cloud Highly Toxic"
Among the lasting images of 9/11 are images of nearly everyone and everything in the immediate vicinity of the World Trade Center covered in thick dust. The pH of the dust was very high, meaning it was highly alkaline. "That means it's extremely caustic and would be like inhaling powdered lye or Drano," said Dr. Philip Landrigan, dean for global health at Mount Sinai School of Medicine. Learn more.