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The abbreviations on this page were originally defined on the United States Environmental Protection Agency website.
OAQPS: Office of Air Quality Planning and Standards
OCD: Offshore and Coastal Dispersion
ODP: Ozone-Depleting Potential
ODS: Ozone-Depleting Substances
OECA: Office of Enforcement and Compliance Assurance
OECD: Organization for Economic Cooperation and Development
OF: Optional Form
OI: Order for Information
OLC: Office of Legal Counsel
OLTS: On Line Tracking System
O&M: Operations and Maintenance
ORE: Office of Regulatory Enforcement
ORM: Other Regulated Material
ORP: Oxidation-Reduction Potential
OTAG: Ozone Transport Assessment Group
OTC: Ozone Transport Commission
OTIS: Online Tracking Information System
OTR: Ozone Transport Region