Lead is only in avgas used by piston engines. Approximately zero firefighting aircraft use piston engines at this point - turbine power and reliability are so g

Lead is only in avgas used by piston engines. Approximately zero firefighting aircraft use piston engines at this point - turbine power and reliability are so good that most firefighting aircraft that started with piston engines have been retrofitted (e.g. Calfire's Turbo Trackers).