 A study found approximately 36% higher levels of lead in Port Arthur residents compared to Hanover, New Hampshire residents.A study by the University of Texas Medical Branch at Galveston indicates that Port Arthur residents located around the refinery are four times more likely than Galveston residents to have heart and respiratory conditions, nervous system and skin disorders, headaches and muscle aches, and ear, nose, and throat ailments.Black residents in the area suffer the most.