Janis Schreiber, 72, lives about a half-mile from Dairyland Cooperative's two coal-fired power plants in Alma, Wis. Her nonsmoker husband suffered from emphysema, a lung disease, before dying in 2006 at age 80. Schreiber, who has breast cancer and knows many neighbors with cancer, said she wonders if the plants' emissions have affected Alma residents' health.

Under legal pressure, Wisconsin coal-fired power plants curb emissions

Dairyland and other Wisconsin coal-fired plants have begun lowering emissions, but not necessarily in response to demands by pollution regulators. Many of the changes have resulted from pressure and lawsuits brought by the nonprofit Sierra Club, which has campaigned for a decade to cut emissions from coal combustion. But enforcement is inconsistent, and some residents living in the shadow of coal plants are concerned their health may be affected.