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In the Palisades burn area, tests found little contamination beyond some isolated “hot spots” of heavy metals and polyaromatic hydrocarbons, Roux’s vice president and principal scientist Adam Love said last week.

Both areas were tested for metals, nutrients, polychlorinated biphenyls and polycyclic aromatic hydrocarbons, which are all chemicals that may be found in water runoff based on previous California wildfires, officials said.

The organization also sampled 25 different polycyclic aromatic hydrocarbons, organic compounds that form when oil, wood or garbage burns.

In homes we were able to test, my colleagues found elevated levels of metals and PAHs – polycyclic aromatic hydrocarbons – in the ash.

Norway's scaled back ambitions in the Arctic have pleased environmentalists who have consistently warned about the impact of drilling for hydrocarbons on both wildlife and the fragile environment of the polar region.