O&M
OPERATION AND MAINTENANCE

OAQPS
OFFICE OF AIR QUALITY PLANNING AND STANDARDS

OCIS
OSHA COMPUTERIZED INFORMATION SYSTEM

OCS
OUTER CONTINENTAL SHELF

ODCs
OZONE-DEPLETING COMPOUNDS

ODP
OZONE-DEPLETION POTENTIAL

ODS
OZONE-DEPLETING SUBSTANCES

OECD
ORGANIZATION OF ECONOMIC COOPERATION AND  DEVELOPMENT

OEETD
OFFICE OF ENVIRONMENTAL ENGINEERING AND  TECHNOLOGY DEMONSTRATION

OEL
OCCUPATIONAL EXPOSURE LIMIT

OEM
ORIGINAL EQUIPMENT MANUFACTURER

OEPER
OFFICE OF ENVIRONMENTAL PROCESSES AND EFFECTS  RESEARCH

OER
OFFICE OF EXPLORATORY RESEARCH

OHEA
OFFICE OF HEALTH AND ENVIRONMENTAL ASSESSMENT

OHM’S LAW
Electric current flow is directly proportional to the voltage and inversely proportional to the resistance.

OHR
OFFICE OF HEALTH RESEARCH

OHST
OCCUPATIONAL HEALTH AND SAFETY TECHNOLOGIST

OIL OF VITRIOL
Oil of Vitriol is the common name for sulfuric acid.

OM&M
OPERATION  MAINTENANCE  AND MANAGEMENT

OMB
OFFICE OF MANAGEMENT AND BUDGET

OMMSQA
OFFICE OF MODELING  MONITORING SYSTEMS  AND  QUALITY ASSURANCE

OPA
OIL POLLUTION ACT

OPIC
OVERSEAS PRIVATE INVESTMENT COUNCIL

ORD
OFFICE OF RESEARCH AND DEVELOPMENT

ORGANICS
Material whose origin can be traced to a living thing   as a vegetable oil;  usually is
an impurity  but can be  useful  as in brighteners.

ORM
OTHER REGULATED MATERIAL

ORP
OXIDATION-REDUCTION POTENTIAL

ORPM
OFFICE OF RESEARCH PROGRAM MANAGEMENT

OSHA
OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION

OSHRC
OCCUPATIONAL SAFETY AND HEALTH REVIEW  COMMISSION

OSPRE
OFFICE OF SCIENCE  PLANNING  AND REGULATION  EVALUATION

OSRP
OIL SPILL RESPONSE PLANNING

OSTI
OFFICE OF SCIENTIFIC AND TECHNICAL INFORMATION

OSTP
OFFICE OF SCIENCE AND TECHNOLOGY POLICY

OSW
OFFICE OF SOLID WASTE

OSWER
OFFICE OF SOLID WASTE AND EMERGENCY RESP0NSE

OTA
OFFICE OF TECHNOLOGY ASSESSMENT

OTTRS
OFFICE OF TECHNOLOGY TRANSFER AND REGULATORY  SUPPORT

OUST
OFFICE OF UNDERGROUND STORAGE TANKS

OUT-OF-CONTROL
A process that exhibits variations larger than the control limits is said to be out-of-control.

OXIDATION
The reaction taking place at an anode. Some oxygen can be generated. A soluble anode dissolve to replenish the
metal being plated at the cathode.