A report released Thursday criticized the Federal Emergency Management Agency over its response time to complaints about 'FEMA trailers'.
The mobile homes were distributed widely along the Gulf Coast after Hurricane Katrina wiped out housing in August 2005.
The Homeland Security Department inspector general report said FEMA lacked a "degree of urgency" in responding to early reports of dangerous levels of formaldehyde in trailers.
The report says that, by not acting quickly, FEMA exposed people to health risks.
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