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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.

The process produces hazardous waste and releases carcinogens like polycyclic aromatic hydrocarbons, which are toxic at very low concentrations.

Other research included in the new review has shown that wildfires can double the soil concentration of a group of toxic chemicals known as polycyclic aromatic hydrocarbons, which can induce chemical reactions that inhibit revegetation.

The bright orange-colored streaks in the Webb near-infrared image signify the presence of carbon-based molecules known as polycyclic aromatic hydrocarbons, or PAHs.