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Surveys show no evidence of long-term health risks caused by Katrina.
New Orleans' waters and soils seem to have survived the ravages of Hurricane Katrina without being contaminated by any toxic sludge.
The massive hurricane flooded the city in August last year with waters that were expected to be contaminated by sewage, petrol, and various household and industrial pollutants, from asbestos to pesticides. But just how toxic those floodwaters were, and what mess they might leave behind, wasn't known.
By October 2005, researchers from Lousiana State University had reported that the floodwaters themselves were not the 'toxic soup' feared, but instead looked much like the drainage you might expect in a city after heavy rain.
