Here are some of the information that has been put together based upon the claims of off-gasing from chinese made drywall.
Homeowners have begun to complain about Chinese made drywall that gives off a egg-like stench
Between 2004-2008, approximately 540,000,000 (540 million) pounds of plasterboard (which includes drywall and ceiling tiles) was imported into the US from China
A majority of the imported drywall entered the US following the 2005 hurricane season that caused a domestic drywall shortage
Chinese drywall was less expensive
The drywall was made with fly ash which may not have been refined (i.e. cleaned) as well as some domestically made drywall.
The Florida Department of Health found the drywall to emit “volatile sulfur compounds” and contained strontium sulfide, which can release hydrogen sulfide in moist air (i.e. rotten egg smell)
A University of New Orleans toxicologist has identified hydrogen sulfide, sulfuric acid, sulfur dioxide and carbon disulfide in the drywall
Agencies of the Chinese government did not respond to repeated Associated Press’ requests for comment