A geographical region of the United States that the EPA has designated as not meeting the air quality standards.
A region where air pollution levels persistently exceed acceptable National Ambient Air Quality Standards (NAAQS) for one or more "critical pollutants." The federal government may use the non-attainment classification to indicate the type of air pollution reduction measures that such areas must adopt, and the pollution reduction timeline.
A non-attainment area does not meet National Ambient Air Quality Standards. The Portland-Vancouver region was classified as a non-attainment region for both carbon monoxide and ozone but is currently classified as an air quality maintenance area.
A region, determined by population density in accordance with the U.S. Census Bureau, which exceeds minimum acceptable NAAQS for one or more "criteria pollutants" (see Clear Air Act Amendments). Such areas are required to seek modifications to their State Implementation Plans, setting forth a reasonable timetable using EPA-approved means to achieve attainment of NAAQS for these criteria pollutants by a certain date. Under CAAA, if a non-attainment area fails to attain NAAQS, EPA may superimpose a Federal Implementation Plan with stricter requirements or impose fines, construction bans, cutoffs in federal grants revenues, and so forth, until the area achieves the applicable NAAQS.
a geographic area that does not meet one or more of the federal air quality standards
A region that exceeds minimum acceptable National Ambient Air Quality Standards (NAAQS) for one or more criteria pollutants, in high population density areas, in accordance with the U.S. Census Bureau population statistics. Such regions (areas) are required to seek modifications to their State Implementation Plans, setting forth a reasonable timetable using means (approved by the Environmental Protection Agency) to achieve attainment of NAAQS by a certain date. Under the Clean Air Act, if a non-attainment area fails to attain NAAQS, the Environmental Protection Agency may superimpose a Federal Implementation Plan with stricter requirements or impose fines, construction bans, or cutoffs in Federal grant revenues until the area achieves applicable NAAQS. Long Island, Nassau and Suffolk Counties, is a non-attainment area.
A designation of the Environmental Protection Agency (EPA) indicating that a geographic region has not met the National Ambient Air Quality Standard (NAAQS) for a transportation-related pollutant(s). In Alaska, portions of Anchorage, Fairbanks, and Juneau are so designated. In Anchorage, areas of the Eagle River area are designated non-attainment for PM-10 (particulate matter of 10 microns or less), while portions of the Anchorage Bowl are designated non-attainment for CO (carbon monoxide).
A geographic area in which a criteria air pollutant level is higher than allowed by the federal standards. A single geographic area may have an acceptable level for one criteria air pollutant, but have unacceptable levels of one or more other criteria air pollutants. Thus, an area can be both an attainment and non-attainment area at the same time. Sixty percent of Americans are estimated to live in non-attainment areas.
A geographical area that does not meet an ambient air quality standard for the pollutant. As of October 1, 1996, the nonattainment areas of Tennessee are: Portions of Shelby and Williamson counties for lead
Area that does not meet one or more of the National Ambient Air Quality Standards for the criteria pollutants designated in the Clean Air Act.
An area identified by an air quality regulatory agency through ambient air monitoring (and designated by the Environmental Protection Agency), that presently exceeds federal ambient air standards.
A geographic area identified by the EPA and/or ARB as not meeting either NAAQS or CAAQS standards for a given pollutant.
An area with concentrations of certain pollutants above National Ambient Air Quality Standards. For example, the Southeast Wisconsin ozone non-attainment area has levels of ozone that exceed the National Ambient Air Quality Standards.
A geographic area that does not meet the federal air quality standards applicable to a variety of critical air pollutants. It is possible for an area to be in attainment for one pollutant, but non-attainment for a different pollutant.
A geographic area that does not meet the National Ambient Air Quality Standards for one or more pollutants.
a geographic area in which the level of a criteria air pollutant is higher than the level allowed by the federal standards. A single geographic area may have acceptable levels of one criteria air pollutant but unacceptable levels of one or more other criteria air pollutants; thus, an area can be both attainment and nonattainment at the same time. It has been estimated that 60% of Americans live in nonattainment areas.
An area that has not achieved air quality as good as the National Ambient Air Quality Standards as defined by the CAAA.
Region not attaining acceptable EPA air quality standards.