As fire crews and air tankers work to block the wildfires' explosive growth, images of red clouds of fire retardant falling onto trees are common. What is it — and what's in it?

As wildfires intensify, state and federal fire agencies are relying more on aerial fire retardant, sparking concerns over its ...

Some of the visuals coming out of Los Angeles County over the past week show a vivid pink substance coating streets, cars and ...

The hot-pink mix of water and chemicals, which is sprayed from planes to combat wildfires, is under renewed scrutiny.

Fire retardant is a mix of chemicals used to extinguish or slow down the spread of fires ... Forest Service scientists in their study found that the effectiveness of aerial retardants depends on ...

Fire retardants are composed of fertilizer chemicals such as ammonium phosphates ... Act by not carrying out proper analysis of aerial fire retardant's impact on the environment and endangered ...

Fire retardants are composed of fertilizer chemicals such as ammonium phosphates ... ruled that the Forest Service had violated the National Environmental Policy Act by not carrying out proper ...

Firefighters work to clear a firebreak on a hillside covered with pink fire retardant in Los Angeles County. The substance is used to slow down a fire's progress. (Ringo Chiu/Reuters - image credit) ...

FILE - Fire retardant is dropped by an air tanker on the Palisades Fire in the outskirts of the Pacific Palisades neighborhood of Los Angeles, Jan. 10, 2025. (AP Photo/Eric Thayer, File) ...

Copyright 2025 The Associated Press. All Rights Reserved. Fire retardant covers a backyard in Mandeville Canyon during the Palisades Fire, Jan. 11, 2025, in Los ...

Carrying massive loads of water or fire retardant, here's a look at the fast-moving specialized aircraft helping contain the spread of LA wildfires.

The substance, vivid against the grey smoke and charred landscape, is fire retardant -- much of it a product called Phos-Chek ...