But such is their persistence that they can also be found in soil, sediment, food, air and house dust, and 97% of Americans have detectable levels in their bodies.

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"It is important to note that based on water, soil and sediment testing already conducted, there is no indication of any risk to the public health or public safety, " the FBI said.

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They will record plant species, forest structure, ash cover, soil properties, river sediment and the overall topography of the burned area.

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The soil erosion was measured through the needle erosion and the sediment in the runoff.

UNESCO: AQUATACAMA

It was movement of particles of soil, but it has high roughness that reduces the transport capacity of sediment of the runoff.

UNESCO: AQUATACAMA

The sediment of runoff was between 103 and 308 kg ha-1 h-1, while the soil losses by needle erosion were between 6, 3 and 61, 0 ton ha-1.

UNESCO: AQUATACAMA