FRISCO, Texas (AP) — A closed Dallas-area battery recycling plant officially meets U.S. safety standards for lead in a lingering dispute over emissions and contamination.

The Dallas Morning News ( ) reported Monday that the former Exide Technologies Inc. plant in Frisco complies with air-quality requirements.

Exide drew scrutiny for exceeding stricter government air-quality emissions while recycling used vehicle batteries. The EPA drew an invisible rectangle around the plant in 2010 after the amount of lead escaping from the smelting operations into the air was deemed unsafe.

The plant closed in late 2012.

As of December, air-quality monitors positioned around the plant measured 36 continuous months of compliance. Texas regulators are soon expected to take steps toward removing the site's nonattainment designation.

Mayor Maher Maso (MAY'-her MAH'-soh) says Frisco is very healthy and environmentally friendly.