https://ehp.niehs.nih.gov/doi/10.1289/ehp.1003231 https://ehp.niehs.nih.gov/doi/10.1289/ehp.1003231 "On the basis of distance to airport coefficients, children

https://ehp.niehs.nih.gov/doi/10.1289/ehp.1003231 https://ehp.niehs.nih.gov/doi/10.1289/ehp.1003231 "On the basis of distance to airport coefficients, children living within 500 m, 1,000 m, or 1,500 m of an airport had average blood lead levels that were 4.4, 3.8, or 2.1% higher, respectively, than other children." On the other hand, in 1971 lead averaged 2.5 g/gal. (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6522252/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6522252/ which has a nifty graph of leaded gas use and air lead concentrations with the neat note, "The increase in air lead concentration between 2000 and 2001 is likely due to changes at sites near stationary industrial sources. The decline in air lead concentrations between 2001 and 2002 is likely due to lower lead concentrations at sites in Herculaneum, Missouri.") 100LL has about 2.1 g/gal. (https://www.exxonmobil.com/en/aviation/products-and-services/products/avgas-100ll https://www.exxonmobil.com/en/aviation/products-and-services...) Ah-hah: Herculaneum https://en.wikipedia.org/wiki/Herculaneum,_Missouri#Lead_pollution https://en.wikipedia.org/wiki/Herculaneum,_Missouri#Lead_pol...