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Lead exposure varies in neighborhoods across the most populous U.S. county. In at least 323 census tracts, more than 5 percent of children tested had elevated levels, a rate exceeding that found in Flint, Michigan. In 26 track, both rich and poor, rates were at least twice that high.
Nearly half of Los Angeles County’s homes were built before 1960. The lead was banned from household paint in 1978, but old paint can peel, chip, or pulverize into toxic dust.
