Toxic levels of selenium Some agencies have put forward a chronic reference exposure level of 0.02 mg/m 3 for selenium and its compounds, as well as 0.00008 mg/m 3 for hydrogen selenide.

Ocean pollution is widespread and getting worse, and when toxins in the oceans make landfall they imperil the health and well-being of more than 3 billion people, according to a new report by an ...