Eight years ago, two environmental nonprofits sued the U.S. Environmental Protection Agency. The agency was a decade overdue in updating limits on how much hazardous air pollution the country's oil refineries could emit; the groups hoped a lawsuit would force it to act. The result was a regulation that required more than 100 refineries to monitor — and report — levels of cancer-causing benzene along the perimeters of their facilities and to make fixes when concentrations exceed a certain threshold. On Thursday, the Washington, D.C.-based Environmental Integrity Project — one of the two nonprofits that sued the EPA in 2012 — released ...