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Health, environmental impacts of fire retardant Wildfire retardants contain about 85% water, 10% ammonium phosphate fertilizer and 5% minor ingredients — including a colorant to help pilots see where the slurry has already been dropped — according to former U.S. Forest Service employee Andy Stahl.—Lauren Penington, The Denver Post, 2 Sep. 2024 Phos-Chek is a sticky slurry of ammonium phosphate designed to coat vegetation and other fuels to deprive advancing flames of oxygen.—Elvia Limón, Los Angeles Times, 5 July 2023 And runoff from battling wildfires over the years with the use of flame retardant containing ammonium phosphate, has been shown to be toxic to fish.—Jim Robbins, New York Times, 12 Sep. 2023 Phos-Chek, that neon-pink goo that airplanes dump over wildfires, is a sticky slurry of ammonium phosphate designed to coat vegetation and other fuels to deprive advancing flames of oxygen.—oregonlive, 5 July 2023 That brightly colored slurry, known as Phos-Chek, coats vegetation and other fire fuel in a layer of ammonium phosphate, slowing a fire’s advance.—Ryan Fonseca, Los Angeles Times, 5 July 2023
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