Geographic area which does not meet one or more of the National Ambient Air Quality Standards for the criteria pollutants designated by the Clean Air Act. Also any geographic region of the United States that the U.S. Environmental Protection Agency (EPA) has designated as not attaining the federal air quality standards for one or more air pollutants, such as ozone and carbon monoxide.
Any geographic area that has not met the requirements for clean air as set out in the Clean Air Act of 1990.
A locality where air pollution levels persistently exceed National Ambient Air Quality Standards. Designating an area as nonattainment is a formal rulemaking process and EPA normally takes this action only after air quality standards have been exceeded for several consecutive years.
Region that violates EPA air pollution standards.
a geographic area that fails to meet a NAAQS. An area must be officially designated by EPA, under procedures set forth by the Federal Clean Air Act, in order to be classified in nonattainment.
A region or area that fails to meet the National Ambient Air Quality Standards (NAAQS) set by EPA.
defined geographic area that does not meet one or more of the federal air quality standards for the criteria pollutants
A region that exceeds the U.S. National Ambient Air Quality Standards (NAAQS) for one or more criteria pollutants. Such regions, or areas, are required to seek modifications to their State Implementation Plans (SIPs), setting forth a reasonable timetable using means that are approved by the Environmental Protection Agency (EPA) to achieve attainment of NAAQS by a certain date. Under the Clean Air Act, if a nonattainment area fails to attain NAAQS, the EPA may superimpose a Federal Implementation Plan (FIP) with stricter requirements. Also, the EPA may impose fines, construction bans, or cut-offs in Federal grant revenues until the area achieves applicable NAAQS.
A geographic area defined by EPA no meeting the NAAQS for a given pollutant. A single geographic area may have acceptable levels of one criteria air pollutant, but unacceptable levels of other criteria air pollutants.
a geographic area that has failed to attain a National Ambient Air Quality Standard (NAAQS)
a locality where air pollution levels persistently exceed the regulatory standards
an area that has failed to attain the air quality standards set in the NAAQS for a certain air pollutant, in this case ground-level ozone
a region in which the level of a criteria air pollutant is higher than allowed by the federal NAAQS
A geographic area in which one or more of the NAAQS (National Ambient Air Quality Standards) are violated. Nonattainment for ozone is the most common. A specific timetable has been set for nonattainment areas to achieve the standard.
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 Clean Air Act and NAAQS). Such areas are required to seek modifications to their SIPs, setting forth a reasonable timetable using EPA-approved means to achieve attainment of NAAQS for these criteria pollutants by a certain date. Under the CAA, if a nonattainment area fails to attain NAAQS, EPA may superimpose a FIP with stricter requirements or impose fines, construction bans, cutoffs in federal grant revenues, etc., until the area achieves the applicable NAAQS.
A geographic area identified by the U.S. EPA and/or CARB as not meeting either NAAQS or CAAQS standards for a given pollutant.
A geographic area that violates the National Ambient Air Quality Standards.
An area that does not meet ambient air quality standards.
A geographic region of the United States that the EPA has designated as not meeting a given national ambient air quality standard (NAAQS).
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.