Everything to know about red flame retardant dropped during wildfires

KFSN logo
Tuesday, September 17, 2019
What to know about wildfire flame retardant
What's that red stuff they drop during a wildfire? Here's what to know about flame retardant.

What is that red stuff that's dropped from the sky when a wildfire breaks out? It's flame retardant that firefighting crews use to control and contain wildfires.

They don't drop it directly onto flames; rather, firefighters anticipate where the fire might spread, and they drop the retardant ahead of the flames. It doesn't actually extinguish fires, but it does make it harder for trees and leaves to combust and buys firefighters time to clear out brush and vegetation that could cause a fire to spread.

There is, though, an environmental risk associated with retardant, according to AccuWeather. Fertilizer is one component of many retardants because of how it sticks to vegetation to repel flames. It can kill fish and make a waterway toxic with ammonia and phosphate if dropped over or near an aquatic area.

SEE ALSO: These aircraft are on the front lines of the fight against California wildfires

Learn more about some of the airplanes and helicopters used in the battle against California wildfires.