Harris County in Texas plans to sue Valero Energy Corp for pollution from its Houston refinery, the head of the county’s environmental law department said on Friday.  A Valero spokeswoman did not reply to a request for comment. The suit will be brought under a provision of the U.S. Clean Air Act that allows citizens to sue over pollution, said Rock Owens, managing attorney of the environmental practice group in the Harris County Attorney’s Office. In recent years, environmental groups like the Sierra Club and Environment Texas have filed citizen lawsuits against refineries and chemical plants, but it is rare for governments to do so, Owens said. “It’s been extremely unusual in Texas,” he said. “I can’t speak to the rest of the […]