[plazmaphyujin]

Yes. Potentially far, far worse. And people have absolutely died from using fire retardant delivered from air tankers.

These planes have to fly extremely close to the ground to deliver their payload (which is spread over an area far too large to be effective in this case anyway btw) and too often the plane can lose control, whether from sudden unweighting or the turbulence from the fire and crash. This can kill everyone on board and usually starts a new fire to boot.