Aerial fire suppressants are generally a mixture of water, ammonium phosphate — essentially fertilizer — and iron oxide, which is added to make the retardant visible, said Daniel McCurry ...

There are different types of fire retardant but to tackle wildfires in the US, authorities most commonly use Phos-Chek — a brand of fire retardant — which mostly contains an ammonium phosphate-based ...

Aerial fire suppressants are generally a mixture of water, ammonium phosphate — essentially fertilizer — and iron oxide, which is added to make the retardant visible, said Daniel McCurry ...

Besides Cal Fire, multiple agencies have dropped fire retardant and water, including the US Forest Service, the Los Angeles and Ventura county fire departments, the city and the National Guard. How ...