(IL) Chicago Tribune – The Obama administration is cracking down on BP as the oil company overhauls its massive refinery in northwest Indiana, one of the largest sources of air pollution in the Chicago area.

In response to a petition from environmental groups, the U.S. Environmental Protection Agency on Monday ordered Indiana regulators to revamp a new operating permit for the Midwest’s biggest refinery. The groups, along with elected officials in Illinois, contend Indiana had allowed the oil giant to avoid stringent requirements under the federal Clean Air Act. More