California
Area Designations:
Unclassified:
a pollutant is designated unclassified if the data are incomplete and do not support a designation of attainment or
non-attainment.
Attainment:
a pollutant is designated attainment if the state standard for that pollutant was not violated at any site in the
area during a three year period.
Non-attainment:
a pollutant is designated non-attainment if there was at least one
violation of a State standard for that pollutant in the area.
Non-attainment/Transitional:
U.S. EPA Designations:
Non-attainment:
any area that does not meet (or that contributes to ambient air
quality in a nearby area that does not meet) the national primary or
secondary ambient air quality standard for the pollutant.
Attainment:
any area (other than an area identified in clause (i)) that meets the
national primary or secondary ambient air quality standard for the
pollutant.
Unclassifiable:
any area that cannot be classified on the basis of available
information as meeting or not meeting the national primary or
secondary ambient air quality standard for the pollutant.
