A Texas jury will begin hearing arguments Wednesday in a lawsuit in which neighbors of a former BP refinery allege the oil giant's release of toxic gases exposed residents to potential health dangers. The suit is the latest BP has faced over the refinery it used to own in Texas City, where a 2005 explosion killed 15 workers, injured scores of others and cost the oil company $2.1 billion in legal settlements…BP has said in regulatory filings that the refinery emitted toxic gases, but that the releases weren't large enough to sicken neighbors…In the latest case, residents allege that the refinery emitted 500,000 pounds of carbon monoxide, benzene and other air pollutants in April and May of 2010, lowering their property values and putting their health in danger…But BP said health problems cited by plaintiffs could be attributed to any number of factors outside the refinery...[Also refers to Marathon Petroleum]