The vibrant red fire retardant is known as Phos-Chek and has been used by firefighters battling wildland blazes for over 50 years, according to its manufacturer, Perimeter Solutions.

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?

The Dragon Bravo Fire left the historic North Rim Grand Canyon Lodge in ruins. Here's what those on the frontlines and who ...

Large retardant planes get much of the focus of wildfire-fighting attention, but the Jefferson County Sheriff's Office ...

Two federal lawmakers from Colorado are calling on the U.S. Air Force to upgrade its fleet of firefighting planes. In a July ...

Here's what we know about containment, size and evacuations on the Green Fire, burning northeast of Redding in the Shasta-Trinity National Forest.

As California enters the height of wildfire season, Cal Fire aircraft are once again painting red lines across dry hillsides ...

The U.S. Forest Service has shifted aerial wildfire firefighting resources along Colorado's Front Range. Two large 'sky crane ...

Hot, dry and windy conditions in western Colorado have officials looking at long-term plans to fight numerous fires ...

A USDA plane strafes the Cedar Fire near Oracle, Arizona, on May 20, 2025, dropping fire retardant primarily made of water, fertilizer and iron oxide.