The largest result in the avgas paper, for children living within 500m of an airport, put their lead levels at 0.043 micrograms/dl higher than the general popul

The largest result in the avgas paper, for children living within 500m of an airport, put their lead levels at 0.043 micrograms/dl higher than the general population. From this paper[1], "An increase in blood lead from 10 to 20 micrograms/dl was associated with a decrease of 2.6 IQ points". So while there is an impact on lead levels, it is not nearly large enough to lead to the loss of 1-2 IQ points. I'm not saying we shouldn't get rid of leaded avgas, but it accounts for about 0.1% of gasoline used in the US so the impact will be much smaller than banning leaded fuel for cars was. [1] https://pubmed.ncbi.nlm.nih.gov/8162884/ https://pubmed.ncbi.nlm.nih.gov/8162884/