Latino Policy Forum and others report on those at risk from industrial air pollution...

" The 2007 report found that of the more than 9 million people estimated to live within 1.8 miles of the nation's 413 commercial waste facilities, more than 5.1 million are people of colour.

Other research has confirmed similar disparities. A 2000 study by the Dallas Morning News and the University of Texas-Dallas found that almost half of the nearly 2 million federally-subsidized apartments for low-income people were within about a mile of factories releasing toxic emissions.

A 2001 report by the Latino Policy Forum determined that 68 percent of African Americans live within 30 miles of coal-fired power plants, compared to 56 percent of whites. And a 2005 Associated Press investigation found that blacks are 79 percent more likely than whites to live in areas most at health risk from industrial air pollution."
from: "ENVIRONMENT-US: Toxins Threaten to Uproot Entire Town"
By Mark Weisenmiller
http://www.propeller.com/viewstory/2007/11/01/florida-toxins-threaten-to-uproot-an-entire-town/?url=http%3A%2F%2Fwww.ipsnews.net%2Fnews.asp%3Fidnews%3D39889&frame=true

Arsenic

"Test wells drilled into the intermediate aquifer underneath the [E. Helena MT] Asarco smelting property in 2001 revealed arsenic present at 31 to 34 parts per million (i.e. 34 ppm in the water) — more than 3,000 times the federal standards for drinking water."
Asarco to present public updates (article from E. Helena MT Asarco plant)

Arsenic in Canal-water above the El Paso Water Utilities' (EPWU) Canal-street treatment plant near Asarco El Paso was 37 ppm, according to TCEQ (TNRCC) samples from '95. (DAMAGE CASES AND ENVIRONMENTAL RELEASES FROM MINES AND MINERAL PROCESSING SITES 1997 U.S. Environmental Protection Agency, page 215)