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attainment area
at·tain·ment ar·e·a (plural at·tain·ment ar·e·as)


noun 
Definition:
 
clean air area: a geographic area where the concentration of a particular air pollutant does not exceed federal standards
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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