Wildfires: What is the red 'retardant' dropped over forests?
Used to slow the advance of flames, FIRE-TROL 931 is made up mainly of water and ammonium polyphosphate. While it does have some environmental impact, the risk is minor compared to the effects of wildfires and their smoke on human health and the environment.

<p>Used to slow the advance of flames, FIRE-TROL 931 is made up mainly of water and ammonium polyphosphate. While it does have some environmental impact, the risk is minor compared to the effects of wildfires and their smoke on human health and the environment.</p>