Naturally occurring background definition
Naturally occurring background means the quality of individual media in the vicinity of a discharge of a hazardous sub- stance or environmental pollution that has not been affected by a hazardous substance discharge or environmental pollution.
Examples of Naturally occurring background in a sentence
Naturally occurring background levels for PID monitoring range between 0.0 ppm and 2.0 ppm but can also fluctuate due to ambient conditions (e.g. nearby traffic exhaust, high humidity, excess moisture).