An area considered to have air quality as good as, or better than, the National Ambient Air Quality Standards (NAAQS) as defined in the Clean Air Act. An area may be in attainment for one or more poll [..]

Attainment area is an area considered to contain air quality as good as or better than the National Ambient Air Quality standards as defined in the Clean Air Act (CAA). An area may be an attainment ar [..]

An area considered to have air quality as good as, or better than, the acceptable level of a pollutant in the air set by the federal government(acceptable levels are called ambient air quality standards as defined in the Clean Air Act).

An area considered to have air quality as good as or better than the national ambient air quality standards as defined in the Clean Air Act. An area may be an attainment area for one pollutant and a n [..]

An area considered to have air quality as good as or better than the national ambient air quality standards as defined in the Clean Air Act. An area may be an attainment area for one pollutant and a n [..]

An area considered to have air quality as good as or better than the national ambient air quality standards as defined in the Clean Air Act. An area may be an attainment area for one pollutant and a [..]

A geographic area that meets or has pollutant levels below the National Ambient Air Quality Standards. Also see nonattainment area.

A geographical area identified to have air quality as good as, or better than, the national and/or California ambient air quality standards

A geographic area that the US EPA has designated as meeting the NAAQS for a specified pollutant. (See nonattainment area.)

A geographic area that is in compliance with the National and/or California Ambient Air Quality Standards (NAAQS or CAAQS).

A geographic area in which levels of a criteria air pollutant meet the health-based primary standard (national ambient air quality standard, or NAAQS) for the pollutant. An area may have on acceptable level for one criteria air pollutant, but may have unacceptable levels for others. Thus, an area could be both attainment and no attainment at the sa [..]

A geographic area that meets the National Ambient Air Quality Standard (NAAQS) is called an attainment area. An area with too much of a pollutant to meet the NAAQS for that pollutant is called a nonat [..]

– A geographic area where the measured concentrations of the criteria pollutants are within the National Ambient Air Quality Standards (NAAQS).

A geographic region, which is in compliance with the National and/or California Ambient Air Quality Standards for a criteria pollutant under the Federal Clean Air Act or California Clean Air Act.