@Paul Osborne There's no need. I am quite aware that the AvGas used by the older, generally larger, aircraft has 4 times the lead of unleaded gasoline. Even so, with the quantities used, the heights at which most of it will be emitted, the lead poisoning risks to people living near a small airfield are laughably small.

@Paul Osborne they will be Rotax, or Lycoming, or Continental, None of which uses smelly, paraffin-like jet fuel

The airfield fumes you speak of are from jet fuel. No light aircraft use jet fuel, they all use normal unleaded, or AvGas, which is still just basically gasoline, not paraffin