{"data":{"id":"us-va/4vac25-40-720","jurisdiction":"us-va","citation":"4VAC25-40-720","heading":"Employee exposure limits to airborne contaminants","body":"With respect to airborne contaminants, the following shall apply:\n\n1. Employees shall be withdrawn from areas where airborne contaminants given a \"C\" designation in Threshold Limit Values and Biological Exposure Indices are present in concentrations that exceed specified TLVs.\n\n2. Control of employee exposure to harmful airborne contaminants shall be by feasible engineering control methods. If such control measures are not available, an approved program of controlling employee exposure to airborne contaminants shall be implemented by the operator. Miners exposed for short periods to gas, dust, fumes and mist-inhalation hazards shall wear  acceptable respiratory equipment appropriate for the hazard. When the exposure is for prolonged periods, other measures to protect workers or to reduce the hazard shall be taken.","path":["Title 4. Conservation And Natural Resources","Agency 25. Department of Energy","Chapter 40. Safety and Health Regulations for Mineral Mining","Part V. Air Quality and Physical Agents—Surface and Underground"],"source_url":"https://law.lis.virginia.gov/admincode/title4/agency25/chapter40/section720/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:45:55Z","sha256":"93e8f4649a5cefd520f253e7e354083b24a5aec03ecb3cf1a93eb4b449ca4626","source_id":"us-va-vac","stale":false,"prev":"us-va/4vac25-40-710","next":"us-va/4vac25-40-740"},"notice":"GroundRules: Original legal text. Not legal advice."}