Oil and grease

Operations & Maintenance

Owner/Operator

Ozone

Oklahoma Administrative Code (OAC 252:100 deals with air quality rules)

Office of Air Quality Planning and Standards (EPA)

Oxygen Breathing Apparatus

Oklahoma Corporation Commission

Oklahoma Department of Environmental Quality

Ozone-Depleting Substance

A method used in the 1990 Clean Air Act to give companies which own or
operate large (major) sources in nonattainment areas flexibility in meeting
overall pollution reduction requirements when changing production
processes.  If the owner or operator of the source wishes to increase
release of a criteria air pollutant, an offset (reduction of a somewhat greater
amount of the same pollutant) must be obtained either at the same plant or by
purchasing offsets from another company.

Office of Hazardous Materials Regulation

Office of Hazardous Materials Transportation

On the Job Training

Office of Management and Budget

Oil Pollution Act of 1990

A visual rating system used to evaluate smokestack emissions.

Other Potentially Infectious Material

US
EPA Office of Research and Development

Other Regulated Material (US DOT)