Those who work with lead-such as metal smelters, welders, or pottery makers-are at a higher risk of lead poisoning.

Adults who work with lead either in their occupation or as a hobby, such as metal smelters, pottery makers, or stained glass artists.

"The problem with incinerators is that they really act as metal smelters," said Dr. Denison of the defense fund.

Life After Pollution Few structures have come to symbolize environmental decay better than industrial-size metal smelters.

Pollution from metal smelters and a fast growing battery industry has been responsible for most cases of particularly high levels.

In July 2010, Canadian-based company Dundee Precious Metals bought the metal smelter in Tsumeb, saving it from closure and maintaining around 200 jobs.

Specimens collected near metal smelters and urban areas have a higher cadmium content.

Another is that a lot of energy-intensive industries, from metal smelters to fertilizer makers, have moved offshore, so they are no longer counted in the statistics that measure the American economy.

The other notable feature of the town is the metal smelter, currently owned by Namibia Custom Smelters.