(Portland, OR)  --  The Oregon State Department of Environmental Quality says air-quality tests in Southeast Portland continue to show levels of toxic chromium in the air.  DEQ air-quality manager Keith Johnson tells KATU-TV even though furnaces at Bullseye Glass aren't using chromium, firing them up is believed to be mobilizing chromium that remains in the smoke stacks.  Johnson says DEQ has given Bullseye until September 1st to clean its exhaust stacks and remove the residual chromium.  Bullseye Glass contends the latest DEQ tests are inconclusive.