Nippon Steel scored so low because it’s actually been increasing its usage of coal in recent years, and recently reinvested in coal at a U.S. Steel plant in Indiana.
Three Rivers Waterkeeper claims U.S. Steel continued to release oily pollution into the river even after it signed a consent agreement with the state to stop.
U.S. Steel agreed to find out where the oil is coming from and fix the problem. The company will also install cameras to monitor its discharge into the river.
The federal board investigating the fatal August explosion at the Clairton Coke Works says the incident happened when a crew did maintenance on a gas isolation valve.