Two expert witnesses, one for a coal-fired power plant and one for the people who allege that it polluted the surrounding area, will be allowed to testify about their air modeling reports, a federal judge has ruled.

Three related cases were consolidated for discovery after dozens of people who live near the Bruce Mansfield Power Plant in Shippingport, Pa., filed suit against the plant when white and black rain fell on the area, allegedly causing property damage and health problems.