Fema had supplied trailers for people whose homes had been destroy during hurricane katrina and later it became apparent that the air in these trailers was contaminated with unhealthy levels of

Katrina was a major disaster and the contamination with the unhealthy levels of formaldehyde did not help at all.  Formaldehyde is a colorless gas that has a quite strong smell and at a room temperature is not flammable but unfortunately the smell is not the only problem as formaldehyde can cause severe health issues.

answer; limbic system;

the answer is implicit statements