In the United States, the use of lead in paint has been decreasing since its peak around 1920. Congress passed the Lead-Based Paint Poisoning Prevention Act in 1971, and lead in household paint was banned in 1973. The amount of lead used in paint in a certain state can be modeled by

In the United States the use of lead in paint has been decreasing since its peak around 1920 Congress passed the LeadBased Paint Poisoning Prevention Act in 197 class=
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