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What does AA stand for?

AA stands for Attainment Area (EPA)

This definition appears frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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We have 149 other meanings of AA in our Acronym Attic

Samples in periodicals archive:

Available data for 2005 show that the Evansville ozone attainment area, which consists of Vanderburgh and Warrick counties, continues to attain the eight-hour standard.
Available data for 2005 show that the Evansville ozone attainment area, which consists of Vanderburgh and Warrick counties, continues to attain the eight-hour standard.
8 296 Also, in ozone attainment areas where 250 tons per year of NOx emissions may be considered a major source, engines above 2,000 horse-power may be a major contributor depending on engine and site-specific conditions.
According to EPA, the letters are part of a formal designation process that began earlier this year, when states and tribes sent updated nonattainment and attainment area boundary recommendations to EPA.