Government officials and environmentalists in Illinois want an administrative review of an air quality variance that Indiana granted BP America for the company's Whiting oil refinery.
That variance would allow BP to continue to emit the same amount of tiny particles into the air as it currently does, rather than cutting its emissions by half.
Because the federal government has doubled its estimates of how much particulate matter is emitted from gas, BP would have to reduce its emissions by about 50 percent to comply with its current limits.
The City of Chicago, the Illinois Attorney General and environmental groups filed their petition Friday over the variance issued July 5th by the Indiana Department of Environmental Management. An environmental judge is expected to respond in the coming weeks.