Letter O

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O&M Operation and Maintenance
OAH Office of Administrative Hearings (California)
OAL Office of Administrative Law (California)
OAR Oregon Administrative Rules
OBES Office of Basic Energy Sciences (DOE)
OCMV Open Container In Morot Vehicle
OD Outside Diameter
ODP Open-Dripproof
OECM Office of Enforcement and Compliance Monitoring (US EPA)
OEHHA Office of Environmental Health Hazard Assessment (Cal/EPA)
OES Office of Emergency Services (California)
OHMP Occupational Health Maintenance Program
OLN Operator's License Number (driver's licence)
OMB Office of Management and Budget (Federal)
ONWI Office of Nuclear Waste Isolation (Federal)
ORM Other Regulated Material (DOT terminology)
ORM Other Regulated Materials Terminology used in hazardous materials shipping documents.
OR-OSHA Oregon Occupational Safety and Health Administration
ORP Oxidation Reduction Potential
ORPS Occurrence Reporting and Processing System
ORR Operational Readiness Review
OSA Office of the State Architect (California)
OSC On Scene Coordinator
OSHA Occupational Safety & Health Administration, a part of the US Department of Labor, it regulates many job safety issues, including chemical handling and storage; also Occupational Safety & Health Act, the US Federal legislation which created OSHA (the Administration) and NIOSH.
OSHRC Occupational Safety and Health Review Commission, provides the ultimate administrative review of challenges to OSHA citations. Its decisions may be appealed to the US Federal Court system.
OSWER Office of Solid Waste and Emergency Response, an agency of the US EPA
OTA Office of Technology Assessment, a staff arm of the US Congress
OV/AG Organic Vapor/Acid Gas (somewhat misleading term referring to capabilities of certain air-purifying respirator cartridges)
OWG Operations Working Group

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