Sources of lead exposure in Mexico City.

Environ Health Perspect · 1994 · PMC1566949 · PMID 7523102

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a decreasing trendno p-value reported

These findings point out that leaded gasoline and LGC play a major role in the population's exposure to lead. Recently, several measures to decrease lead exposure have been implemented, and a decreasing trend in blood lead levels has been observed among some groups of the population in Mexico City (31).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.