FEMA Trailers probably don't contain formaldehyde at a higher rate than, say, your average grandpa lying on a coroner's slab, ready for shipping to the great beyond. And, after all, unlike that pine box Gramps is heading into, the FEMA Trailer was never intended as a permanent dwelling place. I mean, if you're still living in a FEMA Trailer two to three years down the line from one of God's smote storms, you really have bigger worries than whether your trailer is going to give you an asthma attack or the cancer.