Glossary O

The Environmental Glossary. Letter O +++ Popular Articles: 'Ozone-depleting substance', 'Ozone', 'Organism'

An OTHER PESTICIDE CHEMICALS is Chemicals registered as pesticides but which are produced and marketed mostly for other purposes, i.e., multi-use chemicals.

An OUTDOOR AIR SUPPLY is air brought into a building from the outdoors (often through the ventilation system) that has not been previously circulated through the system. Also known as

An outfall is the pipe through which industrial facilities and wastewater treatment plants Discharge their Effluent (wastewater) into a waterbody.

An Outlier is an extreme observation that is shown to have a low probability of belonging to a specified data population; any item rejected by the sampler, analyst, or data reviewer, usually accompanied by an attendant explanation.

Output Pollution control see Pollution cleanup.

Over the Counter Drugs are Medications available without prescription.

An over-development is expansion or development of land to the point of damage.

An over-fishing is fishing beyond the capacity of a population to replace itself through natural reproduction.

An over-grazing is grazing livestock to the point of damage to the land.

An Overall Confidence: is EPA has assigned an overall confidence level for each pollutant based on consideration of the combined uncertainties from emissions estimation, ambient concentration modeling, and exposure modeling.

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