DAO 2021-09 aims to reduce risks from exposure to which substance?

• A. Lead exposure
• B. Mercury exposure
• C. Chromium VI exposure
• D. Arsenic exposure

Answer: (C)

Regulating highly toxic chemicals to limit exposure in the workplace and environment is the aim here. Hexavalent chromium, chromium in its Cr(VI) form, is exceptionally hazardous: it is a known carcinogen and irritant that can cause lung cancer, nasal and sinus issues, skin ulcers, and systemic harm with inhalation, ingestion, or dermal contact. It is extensively used in chrome plating, metal finishing, pigments, and some alloys, which creates real exposure risks for workers and potential environmental releases. A Chemical Control Order for chromium VI would tackle this risk by outlining when and how the substance can be produced, imported, used, stored, and disposed of; setting permissible exposure limits; requiring risk assessments, medical surveillance where appropriate, and exposure monitoring; mandating proper labeling, storage, and engineering controls; and establishing enforcement measures to ensure compliance. While other toxic substances such as lead, mercury, or arsenic are also dangerous and subject to regulation, the DAO in question targets chromium VI because of its particularly high carcinogenic risk and the need for tight control in industrial settings.