To save people the full read, here is the most relevant sentence: > children living within 500 m, 1,000 m, or 1,500 m of an airport had average blood lead leve

To save people the full read, here is the most relevant sentence: > 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.