New Jersey health officials have closed two athletic fields after discovering high levels of lead in their nylon-based artificial turf, setting off a scramble in other states to re-examine the safety of manufactured grass. Lead is used in the pigment that colors the turf, and officials worry that disintegrating fibers could cause children playing on the fields to ingest lead dust. The U.S. Consumer Product Safety Commission is examining the fields, where lead levels were found to be eight to 10 times the maximum allowable level on at least one field.

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