Radioactivity Concerns
Early reporting raised concerns about the presence of phosphogypsum, gypsum formed as a by-product of processing phosphate ore into fertilizer with sulfuric acid. Phosphogypsum is radioactive due to the presence of naturally occurring uranium and radium in the phosphate ore. The substance has been banned for use in U.S construction since 1989. Tests of drywall samples by the EPA and the Florida Department of Health showed some radioactivity, but at levels no higher than those ordinarily found in the natural environment.
Read more about this topic: Chinese Drywall
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—Alfred Döblin (1878–1957)