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?

Aircraft battling fires raging through the Los Angeles area are dropping hundreds of thousands of gallons of hot-pink fire ...

It’s widely used because it can slow flames in ways that water can’t. But it also contains heavy metals and other harmful ...

Parts of Southern California are covered with pink fire retardant as firefighters try to control deadly wildfires raging in ...

(Ringo Chiu/Reuters) Fire retardants are composed of fertilizer chemicals such as ammonium ... by not carrying out proper analysis of aerial fire retardant's impact on the environment and ...

Environmental experts have said that spraying fire retardant using planes is ineffective, expensive and a growing source of ...

Chek, has been dropped from nine large planes and 20 water-dropping helicopters across the city to fight the fires that have ...

Phos-Chek retardants are being dropped by planes around Los Angeles to limit the devastation from wildfires. Retardant use ...

In a video, the California Department of Forestry and Fire Protection demonstrated exactly what could happen to a car that’s caught in the path of one of its aerial firefighters. CAL FIRE/USFS ...