Jennifer Sarandow Schultz via The New York Times has provided a great article on the unfolding issues with imported Chinese drywall.  Some clues that may help you determine whether you have a home with Chinese drywall, with higher levels of certain chemicals than domestic version are as follows.  But first contact your home's builder, who may be able to immediately answer the question for you.

• A sulfuric or rotten egg smell.
• Corrosion (or blackening) of metal items like bathroom fixtures.
• Health problems like itchiness, difficulties breathing and headaches.

On the Product Safety Commission website, there are images of what corrosion from faulty drywall products can look like.  They also have a Q&A on the subject within its broader drywall information center.

To access a more complete article on this subject you can click on the following link: The Telltale Sings of Chinese Drywall