Hurricane Katrina devastated homes along the coast

Hundreds of thousands of people were made homeless when Hurricane Katrina devastated parts of the coast of the southern United States in 2005.

What followed was the biggest emergency housing operation in American history and thousands of survivors were rehoused in travel trailers by the federal government's emergency management agency - FEMA.

But many people have since claimed that the trailers made them sick. For Assignment Rob Walker travels to Mississippi to hear their story.

First broadcast in November 2008

Listen to the programme (22 mins)