"... foul odors seeping from walls. Hundreds of homeowners, most in Florida, have reported corrosion to their air conditioners, mirrors, electrical outlets and even jewelry."
We knew, or suspected most of that. But check this:
"Some Chinese experts, however, suspect that the culprit is a RADIOACTIVE phosphorus substance - phosphogypsum - that is banned for construction use in the U.S. but has been used by Chinese manufacturers for almost a decade."