[maxcan]

AvGas is only used by small, piston powered aircraft.

Jets fly on Jet-A which is basically high-grade kerosene and AFAIK, lead free.

The only airports that could be giving off lead would be very busy, general aviation airports like Van Nuys, not commercial airports like LAX or JFK. Even then, the effect is barely detectable.

[GekkePrutser]

And a lot of those are getting converted to turbodiesel now which means they can run on Jet-A1 too. Avgas is really expensive and hard to get these days.

[maxcan]

In Europe yes, less so in the US.