The suit alleges that TVA has violated opacity limits for the last five years at its Kingston and John Sevier plants west and north of the park.
Opacity measures the amount of light that can penetrate smokestack emissions.
Re-cords show that the agency has been in violation longer, but a federal statute of limitations bars civil actions for violations that are more than five years old. In fact, it's among the most polluted national parks in America. TVA is a federal agency and a major source of that air pollution. We want the agency to do much, much more to protect the park. TVA supplies electricity to more than 8 million people in seven southeastern states.