PORTLAND, Ore. (KOIN) — The CEO and co-owner of Bullseye Glass wrote a letter to Oregon lawmakers Monday, agreeing to stop using arsenic indefinitely.

The glass manufacturer previously agreed to suspend the use of cadmium, arsenic and chromium while the DEQ investigates the metals in the air, which are coming from Bullseye. Now, it says it will stop using them even after the investigation.

Cadmium and arsenic are common metals used in the glass industry.

In recent findings, DEQ found arsenic levels around 150 times the state’s healthy benchmark for ambient air. Cadmium levels were 50 times the suggested air quality limit.