Prevalent levels

Prevalent Levels
Levels of airborne contaminant occurring under normal conditions.

Prevalent Levels
Prevention of Significant Deterioration (PSD)
Primacy
Primary Drinking Water Regulation
Primary Effect
Primary Standards
Primary Waste Treatment
Principal Organic Hazardous Constituents (POHCs)
Prior Appropriation ...

See also: Parts per billion, Partition coefficient, Significant deterioration, Particulate, Primacy