ambient air standard

noun

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.

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What does "habitué" mean?

a person who is especially competent to pass critical judgments in an art, particularly one of the fine arts, or in matters of taste.

a frequent or habitual visitor to a place.

a lazy person who stays in bed long after the usual time for arising.

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Origin of ambient air standard

First recorded in 1970–75

Words nearby ambient air standard

ambidexterity, ambidextrous, ambien, ambience, ambient, ambient air standard, ambient music, ambient noise, ambiente, ambiguity, ambiguous