The lead is in all avgas. The solution there is for the FAA to allow unleaded avgas, not to shut down all aviation.
PAO used to be located on what is now El Cameno a couple blocks north of Page Mill. Between Stanford Ave and Serra St. The area is called Escondido Village today.
Eventually more and more people moved near there despite knowing there was a noisy airport there first. Then they complained about noise and caused the airport to relocate to its current baylands location.
