Toxic mold just could be the #1 health concern in the Southeast US,

because it thrives in moist enviroments and crawlspaces. 

Thousands of homes each year, in the Southeast, are built with vented dirt crawlspaces and yet virtually all building science experts agree that vented dirt crawlspaces are a bad idea.  Therefore, crawlspace mold treatment and encapsulation are the only permanent solutions to "sick" dirt crawlspaces.