There is data that says they have higher levels of lead [1]. About 4% higher than normal in children living within 500 m of a general aviation airport, dropping off with distance to insignificance at around 1000 m.
Note the the linked study did not consider wind patterns. Other studies cited in that one suggest that wind matters a lot, with someone downwind by a given distance getting a higher exposure than someone upwind the same distance.
Note the the linked study did not consider wind patterns. Other studies cited in that one suggest that wind matters a lot, with someone downwind by a given distance getting a higher exposure than someone upwind the same distance.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3230438/