Associated Press - June 24, 2009 3:24 PM ET
ST. LOUIS (AP) - 1 of the world's largest primary lead smelters - and the only one operating in the U.S. - is working with Missouri air regulators to comply with a stricter federal health standard for airborne lead.
The new standard, announced in October, comes just after the Doe Run plant attained a less strict standard after years of struggling to meet it.
The Doe Run Co. converts lead ore to lead metal in the nation's only primary lead smelter. The plant is located in Herculaneum, south of St. Louis.
The Missouri Air Conservation Commission meets Thursday to discuss a range of air pollution issues, including Doe Run's efforts to reduce lead emissions.
Doe Run says it will operate within the new standard, but Missouri regulators say it will be a challenge to meet it.