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2017 Word of the Year

ambient air standard

noun
1.
the highest concentration of a specific air pollutant at a particular outdoor location, in a specified unit of time, that is not considered hazardous to humans:
The ambient air standard for gas X is 3 parts per million per hour.
Origin of ambient air standard
1970-1975
First recorded in 1970-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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