MICHAEL BEHAR – The health risks of leaded gasoline are a thing of the past, right? Wrong. While jets and turboprops run on kerosene-based fuels, the majority of general aviation aircraft are piston-powered and consume aviation gasoline, or avgas. Populations close to “general aviation†airports (a term that covers nearly all types of flight activity except scheduled commercial passenger service) suffer the consequences of exposure to the lead in avgas.