ATSDR Profile Chromium Chromium 0.005 mg/m3 (intermediate) chromium. ATSDR Profile chromium. toxic hexavalent chromium (VI) Chromium ATSDR Tox Portal ATSDR Profile 0.000005 mg/m3 (intermediate); 0.000005 mg/m3 (chronic) ATSDR Tox Portal ATSDR Profile Toxic Substances Portal - Chromium Chromium ATSDR Profile ATSDR Profile chromium. ATSDR Profile Chromium Toxic Substances Portal - Chromium 0.005 mg/m3 (intermediate) 0.0003 mg/m3 (intermediate) Toxic Substances Portal - Chromium