Government officials are urging

 
residents who smell the distinct sulfur odor to check drywall in the attic — where it is less likely to be painted or covered in wallpaper — for a stamp that says Made in China.

How many homes are affected?

No one knows for sure how much drywall from China was delivered to Louisiana, but a newspaper in Florida did an analysis that suggested it could have been installed in as many as 7,000 homes here.