(Portland, OR) -- School district officials say air-quality testing done at five southeast Portland schools last week revealed no detectable levels of arsenic or cadmium. The tests were conducted by PBS Engineering and Environmental, a private company hired by the Portland Public Schools district. The tests were done after the Department of Environmental Quality did air-quality tests that found elevated levels of cadmium and arsenic in southeast Portland. Since the results of those tests were announced, two glass companies in southeast Portland have suspended use of the toxic metals.