LOS ANGELES (AP) — U.S. Sen. Barbara Boxer called Friday for third-party air quality testing to confirm that a massive natural gas leak near Los Angeles has been permanently sealed and it's safe for residents to return home. Residents complained of headaches, nausea and nose bleeds, though public health officials said they do not believe there will be long-term health problems. Many residents concerned about their health and the value of their homes are skeptical of what the utility and public officials tell them and they want the gas facility — the largest of its kind in the West — shut down.