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单词 ambient air standard
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ambient air stand′ard, 
  1. Ecology, Physicsthe 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.
  • 1970–75

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