Maryland’s plea to EPA: Make out-of-state power plants run pollution controls

Some power plants with smog controls aren’t using them effectively — or at all — and are fouling the air hundreds of miles away as a result.

That’s the conclusion reached by the Maryland Department of the Environment, which petitioned the U.S. Environmental Protection Agency this week to make 19 coal-fired plants run their control equipment throughout the summer, when ground-level ozone — often known as smog — is most likely to form....